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FS 8: Environment in the News: Types of Sources

What kinds of sources might I encounter?

Before you evaluate a source, it helps to know what kind of information source you're looking at. Talk with your advisor about the types of sources you should seek and avoid.


Books may be scholarly or popular sources depending on a number of factors including the author and intended audience. Scholarly books tend to be written by scholars active in their fields and are typically published by university presses. These books can include original research published in book form and often include citations for the research used to develop their work. Edited scholarly books may also contain collections of writing that resembles journal articles.

News Articles

You're probably pretty familiar with news articles. They tend to be short pieces written by journalists, not subject experts, and report recent developments in the field. You'll find news articles in popular publications, trade magazines, and scholarly journals. You won't necessarily cite these in your research, but you might use them to learn more about a topic.


You may also be familiar with editorials, or opinion pieces. These tend to be well-researched opinions with or without citations, and can appear in popular publications, trade magazines, and scholarly journals. Since these aren't original research, you might not cite them in your papers, but you could use them to learn about the nuances of a particular experiment or field of research; they might influence the directions you take as a researcher.

Popular Articles

Popular publications like Time magazine and the New York Times publish short articles written by journalists for the general public. You won't cite these in your research but if they parallel specific research articles, they might help you comprehend the scholarly texts.

Trade Magazine Articles

Trade magazines, sometimes called trade journals, find a middle ground between popular publications and scholarly journals. Articles may be longer than those in popular publications, may include a few citations, and do not have the rigor associated with scholarly articles. Readers are professionals in that trade.

Peer-Reviewed Articles

Peer-reviewed articles -- sometimes called research articles, primary research articles, original research articles, and refereed articles  -- are written by and for experts and published in scholarly journals. Unlike popular and trade articles which go through an editorial process, peer-reviewed articles go through a rigorous peer-review process. In short, an author submits an article which is refereed by one, two, three, or sometimes four reviewers. These reviewers are experts in their discipline and peers of the author who is also an expert. Typically the review is "blind" meaning that the identities of authors and reviewers are hidden from one another. These reviewers offer recommendations to the author and may approve or reject an article for publication. Some journals take pride in their high rejection rates.

Review Articles

Review articles, published in scholarly journals, review and summarize developments in a subfield. While readers may be experts in the larger field of physics, they may lack expertise in the subfield and use these reviews to stay informed. Review articles often appear similar to original research articles. To distinguish between the two, you'll need to determine if the authors refer to their own work or if they discuss the research of others.  

Pre-prints & Post-prints

Pre-prints and post-prints refer to scholarly literature before (pre-) peer-review and after (post-) peer-review. Sometimes pre-prints and post-prints are lumped together and considered the unofficial version of a scholarly paper; you can download them from author websites or repositories like arXiv and they'll look like a simple Word document. Although they are unofficial documents that may be riddled with typos, readers value this quick access to new information; the peer review process and publishing both take considerable time.

Conference Proceedings

Conference proceedings are the written versions of research shared at conferences. Experts present their research, and learn from each other at these conferences. Proceedings are sometimes peer-reviewed.

Dissertations & Theses

Dissertations and theses are extensive research projects undertaken while working toward a master's or Ph.D. Although thorough reviews are done by an advisory committee, dissertations and theses do not undergo a formal peer-review process. Although dissertations and theses may be excellent sources of information, only a few print copies exist and libraries are unlikely to lend them out. They are best obtained through online repositories or directly from the researchers themselves.

A Simplified Timeline of Scientific Communication

How can you evaluate and select sources for your research if you don't understand how they differ? Use the following chart to learn more about them.

A simple timeline of scientific communication

Book vs. Journal Article Citations

How can you tell the difference between a book citation and an article citation? Here's a quick overview from "How to Read a Citation" by the University of Memphis libraries.

Book Citation

Darian-Smith, E. (2022). Global burning: Rising antidemocracy and the climate crisis. Stanford University Press.

Book citations inform readers about key elements needed to help them locate the book if desired:  the author's name, book title, publisher, and publication date. Although the format of elements may vary depending on the citation style (MLA, APA, Chicago, etc.) usually all elements will be present in some order.


Article Citation

Keeley, J. E. & Syphard, A. D. (2021). Large California wildfires: 2020 fires in historical context. Fire Ecology17(1).

Article citations inform readers about key elements necessary to help them locate the article if desired:  the author's name, date of publication, title of the article, title of the journal, volume, page numbers. Issue numbers will follow the volume number in more recent publications. Although the format of elements may vary depending on the citation style (MLA, APA, Chicago, etc.) usually all elements will be present in some order.

Popular and Scholarly Sources in the Information Cycle, from the Pfau Library, CSUSB