APA papers follow a particular structure. They are divided in to sections, listed below. Click a heading to see an example of that section:
From Bibme, http://www.bibme.org/apa :
There are two types of citations in APA. In-text citations are found in the body of the project and are used when adding a direct quote or paraphrase into your work. Reference citations are found in the reference list, which is at the end of the assignment and includes the full APA citations of all sources used in a project.
Depending on the types of sources that you used for your project, the format you use for your citations is different for each source type. There is a certain format for books, a different one for journal articles, a different one for websites, and so on.