APA (7th ed.) Citation

Hutchinson, J. (1967). Key to the families of flowering plants of the world (Revised and enlarged for use as a supplement to The genera of flowering plants.). Clarendon Press.

Chicago Style (17th ed.) Citation

Hutchinson, J. Key to the Families of Flowering Plants of the World. Revised and enlarged for use as a supplement to The genera of flowering plants. Oxford: Clarendon Press, 1967.

MLA (9th ed.) Citation

Hutchinson, J. Key to the Families of Flowering Plants of the World. Revised and enlarged for use as a supplement to The genera of flowering plants. Clarendon Press, 1967.