APA (7th ed.) Citation

Society for Promoting Christian Knowledge (Gran Bretaña) & Mackenzie, K. D. (1938). Union of christendom (1st published.). Society for Promoting Christian Knowledge [etc.].

Chicago Style (17th ed.) Citation

Society for Promoting Christian Knowledge (Gran Bretaña) and Kenneth Donald Mackenzie. Union of Christendom. 1st published. London [etc.]: Society for Promoting Christian Knowledge [etc.], 1938.

MLA (9th ed.) Citation

Society for Promoting Christian Knowledge (Gran Bretaña) and Kenneth Donald Mackenzie. Union of Christendom. 1st published. Society for Promoting Christian Knowledge [etc.], 1938.