Just like research papers, it is important to give credit to where you find information for your academic posters . Those sources of information can be books, articles, newspapers, website, personal interviews, etc....
Generally speaking, choose the citation style for the discipline that your poster is representing. For example, if your poster is a science poster, use CSE style. If your poster is in Education or Social Work, use APA. If your poster is in History, use Chicago.
If you have any doubts about which citation style to use, consult with your faculty supervisor or the conference organizers.
The following UWF Library guides will help you with your citations: