APA (7th ed.) Citation

Lewis, C. S., Dorsett, L. W., Mead, M. L., & Gresham, D. H. (1985). Letters to children. Collins.

Chicago Style (17th ed.) Citation

Lewis, C. S., Lyle W. Dorsett, Marjorie Lamp Mead, and Douglas H. Gresham. Letters to Children. London: Collins, 1985.

MLA (9th ed.) Citation

Lewis, C. S., et al. Letters to Children. Collins, 1985.