Cita APA (7th ed.)

Arkowitz, M., & Curjel, C. R. (1967). Groups of homotopy classes (2a. ed.). Springer-Verlag.

Cita Chicago (17th ed.)

Arkowitz, M., i C. R. Curjel. Groups of Homotopy Classes. 2a. ed. Berlín: Springer-Verlag, 1967.

Cita MLA (9th ed.)

Arkowitz, M., i C. R. Curjel. Groups of Homotopy Classes. 2a. ed. Springer-Verlag, 1967.