Cita APA (7a ed.)

Gabriel, P., & Zisman, M. (1967). Calculus of fractions and homotopy theory. Springer.

Cita Chicago Style (17a ed.)

Gabriel, Peter, y Michel Zisman. Calculus of Fractions and Homotopy Theory. Berlin [etc.]: Springer, 1967.

Cita MLA (9a ed.)

Gabriel, Peter, y Michel Zisman. Calculus of Fractions and Homotopy Theory. Springer, 1967.