APA (7th ed.) Citation

Lewis, C. S. (1984). Of this and other worlds (1. publ.). Collins.

Chicago Style (17th ed.) Citation

Lewis, C. S. Of This and Other Worlds. 1. publ. London: Collins, 1984.

MLA (9th ed.) Citation

Lewis, C. S. Of This and Other Worlds. 1. publ. Collins, 1984.

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