Παραπομπή APA

Wringley, G. (1982). Tropical agriculture (4.). Longman Group Ltd.

Παραπομπή Chicago Style

Wringley, G. Tropical Agriculture. 4. London: Longman Group Ltd, 1982.

Παραπομπή MLA

Wringley, G. Tropical Agriculture. 4. Longman Group Ltd, 1982.