APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.