APA (7th ed.) Citation

Herrlich, H., & Strecker, G. E. (1979). Category theory: An introduction (2. ed.). Heldermann.

Chicago Style (17th ed.) Citation

Herrlich, Horst, and George E. Strecker. Category Theory: An Introduction. 2. ed. Berlin: Heldermann, 1979.

MLA (9th ed.) Citation

Herrlich, Horst, and George E. Strecker. Category Theory: An Introduction. 2. ed. Heldermann, 1979.