APA استشهاد

Lefschetz, S. (1942). Algebraic Topology. American Mathematical Society.

استشهاد بنمط شيكاغو

Lefschetz, Solomon. Algebraic Topology. New York: American Mathematical Society, 1942.

MLA استشهاد

Lefschetz, Solomon. Algebraic Topology. American Mathematical Society, 1942.