In addition to providing guidance on grammar, the mechanics of writing, and APA style, this manual offers an authoritative reference and citation system. It also covers the treatment of numbers, statistical and mathematical data, tables and figures.
Types of APA Papers
There are two common types of papers written in fields using APA Style: the literature review and the experimental report. Each has unique requirements concerning the sections that must be included in the paper. There are also general format papers which fit neither of these categories. (From Purdue Owl)