APA (7th ed.) Citation

O'Collins, G. (2008). Catholicism: A very short introduction. Oxford University Press. https://doi.org/10.1093/actrade/9780199545919.001.0001

Chicago Style (17th ed.) Citation

O'Collins, Gerald. Catholicism: A Very Short Introduction. Oxford: Oxford University Press, 2008. https://doi.org/10.1093/actrade/9780199545919.001.0001.

MLA (9th ed.) Citation

O'Collins, Gerald. Catholicism: A Very Short Introduction. Oxford University Press, 2008. https://doi.org/10.1093/actrade/9780199545919.001.0001.