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Citing Sources: APA Style

A guide to citing sources designed and created by Clark Librarians

When Should I Cite?

Any time your work contains or refers to someone else's

  • ideas
  • words
  • images
  • media
  • sounds

... you need to include a citation.

1. In-text citations should be inserted at the point of use in your assignment and indicate that the information you just presented came from a source other than your own brain or common knowledge.

2. A Works Cited or References section should be included at the end of your assignment.

3. In Works Cited / References, list all the works you referred to with in-text citations in the body of your assignment.

4. There are many citation styles, each with it's own precise formatting. The most popular at Clark are MLA and APA.


APA has updated how Digital Object Identifiers (doi) are formatted. Read the short blog post here:

In a nutshell, format the doi to include the “”

APA Style

Guides from Clark College Libraries and other sources:

Formatting Title Page and Headers in APA

When in Doubt - ASK!

If you have any questions about citations or plagiarism that are not answered on these pages, be sure to ask for clarification from:

Get help any time! Call, email, 24/7 Chat. List of library open hours.

Cite Sources - APA - Books

Citations for Graphs and Images

If you include a graph, table, chart, or image that is not your own in the body of your text or on a presentation slide, use the following citation underneath it:


[Your Image Here] 


Figure 1. Description, if needed. Adapted from "Title of Article or Webpage," by Author(s), Year, Title of Journal or Website, Volume, page number, retrieved from URL. Copyright Year by Copyright Holder.

See here and here for specific examples. Also see pages 150-167 of the APA Manual and this APA Style Blog post.

You should also include a full reference citation at the end of your paper or presentation.