Freyd, P. (1964). Abelian categories: An introduction to the theory of functors. Harper & Row.
芝加哥风格引文Freyd, Peter. Abelian Categories: An Introduction to the Theory of Functors. New York: Harper & Row, 1964.
MLA引文Freyd, Peter. Abelian Categories: An Introduction to the Theory of Functors. Harper & Row, 1964.
警告：这些引文格式不一定是100％准确.