Παραπομπή APA

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

Παραπομπή Chicago Style

Hu, Sze Tsen. Homotopy Theory. New York: Academic Press, 1959.

Παραπομπή MLA

Hu, Sze Tsen. Homotopy Theory. Academic Press, 1959.