APA

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. Osford: Clarendon Press.

Chicago

Hutchinson John, . 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. Osford: Clarendon Press.

Harvard

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. Osford: Clarendon Press.

MLA

Hutchinson John, . Key to the families of flowering plants of the world : revised and enlarged for use as a supplement to the genera of flowering plants. Osford: Clarendon Press. 1967.