APA (7th ed.) Citation

Freyd, P. (1966). Abelian categories: An introduction to the theory of functors. Harper & Row.

Chicago Style (17th ed.) Citation

Freyd, Peter. Abelian Categories: An Introduction to the Theory of Functors. New York: Harper & Row, 1966.

MLA (9th ed.) Citation

Freyd, Peter. Abelian Categories: An Introduction to the Theory of Functors. Harper & Row, 1966.