APA (7th ed.) Citation

Mackenzie, J. S. (1931). Cosmic problems: An essay on speculative philosophy. Macmillan & co., ltd..

Chicago Style (17th ed.) Citation

Mackenzie, John Stuart. Cosmic Problems: An Essay on Speculative Philosophy. London: Macmillan & co., ltd., 1931.

MLA (9th ed.) Citation

Mackenzie, John Stuart. Cosmic Problems: An Essay on Speculative Philosophy. Macmillan & co., ltd., 1931.