APA (7th ed.) Citation

Lewis, C. S. (1987). Timeless at heart: Essays on theology (1. publ.). Collins.

Chicago Style (17th ed.) Citation

Lewis, C. S. Timeless at Heart: Essays on Theology. 1. publ. London: Collins, 1987.

MLA (9th ed.) Citation

Lewis, C. S. Timeless at Heart: Essays on Theology. 1. publ. Collins, 1987.

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