Παραπομπή APA

Humphreys, L. R. (1978). Tropical pastures and fodder crops. Longman Group Ltd.

Παραπομπή Chicago Style

Humphreys, L R. Tropical Pastures and Fodder Crops. London: Longman Group Ltd, 1978.

Παραπομπή MLA

Humphreys, L R. Tropical Pastures and Fodder Crops. Longman Group Ltd, 1978.