APA (7th ed.) Citation
Simmons, H. (2011). An introduction to category theory. Cambridge University Press.
Chicago Style (17th ed.) Citation
Simmons, Harold. An Introduction to Category Theory. Cambridge ; New York: Cambridge University Press, 2011.
MLA (9th ed.) Citation
Simmons, Harold. An Introduction to Category Theory. Cambridge University Press, 2011.
Warning: These citations may not always be 100% accurate.