Cita APA (7a ed.)

Reynolds, A. G. (1950). What's the difference?: Protestant and Roman Catholic beliefs compared. United Society for Christian Literature [etc.].

Cita Chicago Style (17a ed.)

Reynolds, Arthur G. What's the Difference?: Protestant and Roman Catholic Beliefs Compared. London: United Society for Christian Literature [etc.], 1950.

Cita MLA (9a ed.)

Reynolds, Arthur G. What's the Difference?: Protestant and Roman Catholic Beliefs Compared. United Society for Christian Literature [etc.], 1950.