Citing Sources: What Information Should be Cited and Why?

Sources of information are cited in order to give the original authors/creators proper credit for their work and to document where an author heard or read the fact or idea that has been incorporated into a new work. The purpose of citations is to let the reader know where you obtained information so sources can easily be located and consulted.

Because knowledge is a cumulative process built on the research and writing of other researchers, your instructor needs to see the quality of the sources you used and how you developed your ideas.

To get started and to see examples, select the citation style from the dropdown menu on the left.

In general, you must document sources when you provide information that you ordinarily would not have known before conducting your research, and when you provide information that it cannot be assumed the reader knows. You must cite a reference when you:

• Discuss, summarize, or paraphrase the ideas of an author
• Provide a direct quotation
• Use statistical or other data
• Use images, graphics, videos, and other media

While you are doing research and locating sources, be sure to document materials thoroughly, noting the author, title, publisher, place of publication, date, and page numbers of all sources used. For electronic materials, you should also note the DOI number (Digital Object Identifier) if available. Note the URL of any website you consult; depending on the source, you may need it for reference.

APA style no longer requires a database name for most references; MLA style still requires it as part of your citation. In either case, make a note of it in case you need to retrieve it at a later date.

Common Knowledge

Things that are common knowledge do not require citation. For example:

• Social networking sites such as Facebook allow people to communicate easily regardless of their location. (does not require citation)
• The Japanese navy attacked Pearl Harbor on December 7, 1941. (does not require citation)

However, if someone draws an original conclusion from a common fact, then you must cite the source:

• The ability to share real-time news and video with the world via social networking sites has emboldened student movements in countries where there is very little freedom of the press. (requires citation)
• Japan's failure to sink any U.S. aircraft carriers in the otherwise devastating attack on Pearl Harbor assured Japan's eventual defeat. (requires citation)

Also, common sayings or proverbs need not be cited:

• "The early bird gets the worm." (common expression with no distinct origin)

Below is a famous saying you might recognize, but it's actually from a poem by Sir Walter Scott. If you read this in a book, of course, you would cite the book. If you already knew this expression, you should still give Sir Walter Scott credit for it because it has a distinct and identifiable origin.

• "Oh, what a tangled web we weave when first we practice to deceive."

We understand that citing your sources can be a little confusing, but it doesn't have to be overwhelming. Before you start, ask yourself these questions:

1. What type of source am I trying to cite?

• Journal article? Book? Webpage?

2. Where did I retrieve that source?

• Library database? Website? Was it a print source?

3. What citation style am I supposed to use for my assignment?

• APA? MLA?

Once you've answered these questions, select the most appropriate option from either the APA or MLA dropdown menu.

To request a one-on-one consultation with a librarian to begin research on a paper, find sources, or review the APA/MLA formatting of their paper and/or references please make an appointment with us through our online web form. We offer both online and in-person options

Ask your program about their guidelines for incorporating information generated by ChatGPT and other AI in your papers. When permissible to use that information directly, use the suggestions below.

To cite the informational product generated by ChatGPT or other AI, the recommendation is for the Methodology and/or Introduction of your paper to specify the following:  

• The prompt you used when utilizing ChatGPT; and 
• The text that the chatbot produced in response. If the response from ChatGPT is lengthy, please include it in the form of an Appendix. 

Please remember that if AI connects you to another resource, you need to cite that resource, just as you would in a literature review. 

As for the in-text citation and the Bibliography/Reference/Works Cited item that will follow this description, apply the appropriate Association's suggestions for citing ChatGPT and AI.