Παραπομπή APA

Haswell, M. R. (1973). Tropical farming economics. Longman Group Ltd.

Παραπομπή Chicago Style

Haswell, M R. Tropical Farming Economics. London: Longman Group Ltd, 1973.

Παραπομπή MLA

Haswell, M R. Tropical Farming Economics. Longman Group Ltd, 1973.