APA (7th ed.) Citation

Helms, R. (1974). Tolkien's world. Thames and Hudson.

Chicago Style (17th ed.) Citation

Helms, Randel. Tolkien's World. London: Thames and Hudson, 1974.

MLA (9th ed.) Citation

Helms, Randel. Tolkien's World. Thames and Hudson, 1974.

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