APA (7th ed.) Citation

Simmons, H. (2011). An introduction to category theory. Cambridge University Press. https://doi.org/10.1017/CBO9780511863226

Chicago Style (17th ed.) Citation

Simmons, Harold. An Introduction to Category Theory. Cambridge: Cambridge University Press, 2011. https://doi.org/10.1017/CBO9780511863226.

MLA (9th ed.) Citation

Simmons, Harold. An Introduction to Category Theory. Cambridge University Press, 2011. https://doi.org/10.1017/CBO9780511863226.