Combinatorics: APA Referencing Style

Combinatorics is a branch of mathematics concerning the study of finite or countable discrete structures. Combinatorial problems arise in many areas of pure mathematics, notably in algebra, probability theory, topology, and geometry.

What Is APA Style?

APA style is a format for academic documents such as journal articles and books. It is codified in the style guide of the American Psychological Association (APA), titled the Publication Manual of the American Psychological Association.