Cita APA (7th ed.)

Lefschetz, S. (1949). Introduction to topology. Princeton university press.

Cita Chicago (17th ed.)

Lefschetz, Solomon. Introduction to Topology. Princeton (N.J.): Princeton university press, 1949.

Cita MLA (9th ed.)

Lefschetz, Solomon. Introduction to Topology. Princeton university press, 1949.