APA استشهاد

Lefschetz, S. (1974). Algebraic topology. American Mathematical Society.

استشهاد بنمط شيكاغو

Lefschetz, Solomon. Algebraic Topology. Rhode Island: American Mathematical Society, 1974.

MLA استشهاد

Lefschetz, Solomon. Algebraic Topology. American Mathematical Society, 1974.