To avoid plagiarism, cite the sources of the information you used for your research poster. Let the reader know where you obtained the information. Cite research or anything that is not your own idea and is not common knowledge.
This applies to:
what you read (books, articles, pamphlets)
what you have viewed (videos or DVDs, online videos, television programs, charts/graphs, illustrations, photos or other images)
what you hear (radio programs, podcasts, lectures)
For examples of citations in an APA (American Psychological Association) reference list (for different types of sources), use the Library's APA (American Psychological Association) Guide (PDF, 7th edition).
The Learning Centre's guide (PDF) to documenting sources using APA shows you how to cite your sources properly within the text of your essay.
For examples of citations in the list of Works Cited for books, articles, videos/DVDs, websites and more, see the Library's MLA (Modern Languages Association) Style Guide.
Here are some more guides to other commonly used citation styles.