APA (7th ed.) Citation

Jack Dale Donald. (1993). Planet earth: Underground worlds. time life books publishing.

Chicago Style (17th ed.) Citation

Jack Dale Donald. Planet Earth: Underground Worlds. London: time life books publishing, 1993.

MLA (9th ed.) Citation

Jack Dale Donald. Planet Earth: Underground Worlds. time life books publishing, 1993.

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