APA (7th ed.) Citation

Innes, C., & Glass, C. (1991). The Illustrated encyclopedia of cacti. Headline.

Chicago Style (17th ed.) Citation

Innes, Clive, and Charles Glass. The Illustrated Encyclopedia of Cacti. London: Headline, 1991.

MLA (9th ed.) Citation

Innes, Clive, and Charles Glass. The Illustrated Encyclopedia of Cacti. Headline, 1991.