APA (7th ed.) Citation

Clarke, J. An answer to the question, Why are you a Christian? (Second edition.).

Chicago Style (17th ed.) Citation

Clarke, John. An Answer to the Question, Why Are You a Christian? Second edition.

MLA (9th ed.) Citation

Clarke, John. An Answer to the Question, Why Are You a Christian? Second edition.

Warning: These citations may not always be 100% accurate.