APA (7th ed.) Citation

Hutchinson, J. (1967). Key to the families of flowering plants of the world. Clarendon Press.

Chicago Style (17th ed.) Citation

Hutchinson, J. Key to the Families of Flowering Plants of the World. Oxford: Clarendon Press, 1967.

MLA (9th ed.) Citation

Hutchinson, J. Key to the Families of Flowering Plants of the World. Clarendon Press, 1967.