Freyd, P. (1964). Abelian categories: An introduction to the theory of functors. Harper & Row.
Lua i Stíl Chicago (17ú heag.)Freyd, Peter. Abelian Categories: An Introduction to the Theory of Functors. New York: Harper & Row, 1964.
Lua MLA (9ú heag.)Freyd, Peter. Abelian Categories: An Introduction to the Theory of Functors. Harper & Row, 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.