APA (7th ed.) Citation

Gray, B. (1981). Homotopy theory: An introduction to algebraic topology (2. print.). Acad. Pr.

Chicago Style (17th ed.) Citation

Gray, Brayton. Homotopy Theory: An Introduction to Algebraic Topology. 2. print. New York u.a: Acad. Pr, 1981.

MLA (9th ed.) Citation

Gray, Brayton. Homotopy Theory: An Introduction to Algebraic Topology. 2. print. Acad. Pr, 1981.