APA (7th ed.) Citation

Tolkien, J. R. R., & Tolkien, B. (1995). Letters from Father Christmas. Houghton Mifflin.

Chicago Style (17th ed.) Citation

Tolkien, J. R. R., and Baillie Tolkien. Letters from Father Christmas. New York, N.Y.: Houghton Mifflin, 1995.

MLA (8th ed.) Citation

Tolkien, J. R. R., and Baillie Tolkien. Letters from Father Christmas. Houghton Mifflin, 1995.