APA-viite (7. p.)

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

Chicago-viite (17. p.)

Gabriel, Peter, ja Michel Zisman. Calculus of Fractions and Homotopy Theory. Berlin, New York: Springer-Verlag, 1967.

MLA-viite (8. p.)

Gabriel, Peter, ja Michel Zisman. Calculus of Fractions and Homotopy Theory. Springer-Verlag, 1967.