APA

Fearn P. J., . (1996). A review of the origins of the Cactus family and the search for a system of classification / P. J. Fearn. Wimborne: Fearn.

Chicago

Fearn P J, . 1996. A review of the origins of the Cactus family and the search for a system of classification / P. J. Fearn. Wimborne: Fearn.

Harvard

Fearn P. J., . (1996). A review of the origins of the Cactus family and the search for a system of classification / P. J. Fearn. Wimborne: Fearn.

MLA

Fearn P J, . A review of the origins of the Cactus family and the search for a system of classification / P. J. Fearn. Wimborne: Fearn. 1996.