Cita APA (7a ed.)

Olum, P. (1961). Invariants for effective homotopy classification and extension of mappings. American Mathematical Society.

Cita Chicago Style (17a ed.)

Olum, Paul. Invariants for Effective Homotopy Classification and Extension of Mappings. Providence: American Mathematical Society, 1961.

Cita MLA (8a ed.)

Olum, Paul. Invariants for Effective Homotopy Classification and Extension of Mappings. American Mathematical Society, 1961.