APA (7th ed.) Citation

Hu, S. T. (1959). Homotopy theory. Academic Press.

Chicago Style (17th ed.) Citation

Hu, S. T. Homotopy Theory. New York: Academic Press, 1959.

MLA (9th ed.) Citation

Hu, S. T. Homotopy Theory. Academic Press, 1959.

Warning: These citations may not always be 100% accurate.