APA (7th ed.) Citation

Tolkien, J. R. R., & Tolkien, C. The book of lost tales. Grafton.

Chicago Style (17th ed.) Citation

Tolkien, J. R. R., and Christopher Tolkien. The Book of Lost Tales. [London]: Grafton.

MLA (8th ed.) Citation

Tolkien, J. R. R., and Christopher Tolkien. The Book of Lost Tales. Grafton.

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