APA Citatie

Widdowson, R. W. (1987). Towards holistic agriculture: A scientific approach. New York: Pergamon Press.

Chicago Style citaat

Widdowson, R. W. Towards Holistic Agriculture: A Scientific Approach. New York: Pergamon Press, 1987.

MLA citatie

Widdowson, R. W. Towards Holistic Agriculture: A Scientific Approach. New York: Pergamon Press, 1987.

Let op: Deze citaties zijn niet altijd 100% accuraat.