"APA" stands for American Psychological Association, and this style of citations is usually used in the sciences and social sciences (think sociology, economics, and business).
We recommend that you create all your citations in NoodleTools because that will ensure your citations are in proper APA format.
In lieu of NoodleTools, we suggest you visit the Purdue Online Writing Lab's APA overview, which includes specific examples of in-text citations, references, sample papers, and more.
APA General Guidelines
APA In-Text Citations - Basic Guidelines
APA References - Basic Guidelines
APA Citation Format for Class Handouts
NoodleTools Steps for Class Handouts:
APA Citation Format for Course Packs
NoodleTools Steps for a Course Pack