As with any publication, you will need to include your sources for a research poster. Remember, you will be citing all sources of ideas, words, and external data that are included in your poster.
Traditionally, , the References section will be the last section of your poster, and you will list all your references/citations in your chosen citation style. You may use a smaller font than the rest of the poster, although you should make sure it is still legible to viewers.
In this example, the References section is in the bottom of the last column.
From: https://sfcollege.libguides.com/research-posters
That's the standard or traditional way - using in-text citations or footnotes with subscript numbers are both quite common, to save space and reduce text (vs using full footnotes). The organization at which you are presenting will probably provide guidelines, and many now allow you to provide references 'off-poster' - via a QR code to a web page or Zotero list, on a handout, or via email to those who request it. If you're unsure, ask, but always make sure your references are available.
Both Chicago and APA styles explain the importance of providing attribution for images and other things being reused. Providing the source of images used is necessary for the same reasons we cite things. There is no standard format for attribution. Both styles recommend using citation format, because that should be easy, or to use a simple legend providing the author, title and date of the work.
If the work carries a licensing statement, it's recommended to provide that statement in full, to avoid confusion between the licensing of your poster and that of the image you are reusing.
On a poster, these can be in small text, and should be directly underneath the image, so that the reader can easily tell which image it applies to.
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