A dictionary definition of appetizer is: any small portion that stimulates a desire for more or that indicates more is to follow. That is what this page links to: reference resources and other materials that give you a taste of a psychology-related concept or idea so that you have an idea of what that concept is before you start to do real research. From these materials you can get an overview of the subject, find out the key issues (and even keywords) of or people important to that subject, learn about its development, and perhaps find citations to other materials for further information on that subject.
The Association of College and Research Libraries (ACRL) defines information literacy as the ability for students to "recognize when information is needed and have the ability to locate, evaluate, and use effectively the needed information." In 2010, ACRL approved information literacy competencies for undergraduate students in psychology. These are based on the general information literacy competencies from ACRL AND the APA Guidelines for the Undergraduate Psychology Majors (2007).
The two databases that follow offer great ideas for research subjects, offering both pro and con views, along with overviews of a subject, current situation, and bibliographies. Are you having trouble coming up with a good topic? Or do you have a topic but you need more information about the issues involved? Check out the two sources below.
In addition to encyclopedias such as Credo Reference and Wikipedia, there are specialized encyclopedias that focus on one discipline or topic. The following are online encyclopedias helpful for psychology topics.