APA (7th ed.) Citation

Merrick, W., O'Sullivan, J., & Stratton, F. (1993). Planet earth / William Merrick, Joan O'Sullivan, Frances Stratton. Oxford University Press.

Chicago Style (17th ed.) Citation

Merrick, William, Joan O'Sullivan, and Frances Stratton. Planet Earth / William Merrick, Joan O'Sullivan, Frances Stratton. Oxford: Oxford University Press, 1993.

MLA (9th ed.) Citation

Merrick, William, et al. Planet Earth / William Merrick, Joan O'Sullivan, Frances Stratton. Oxford University Press, 1993.

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