APA (7th ed.) Citation

Gray, B. (1975). Homotopy theory: An introduction to algebraic topology. Academic Press.

Chicago Style (17th ed.) Citation

Gray, Brayton. Homotopy Theory: An Introduction to Algebraic Topology. New York: Academic Press, 1975.

MLA (9th ed.) Citation

Gray, Brayton. Homotopy Theory: An Introduction to Algebraic Topology. Academic Press, 1975.