Παραπομπή APA

Opeke, L. K. (1982). Tropical tree crops. John Wiley and Sons.

Παραπομπή Chicago Style

Opeke, L K. Tropical Tree Crops. New York: John Wiley and Sons, 1982.

Παραπομπή MLA

Opeke, L K. Tropical Tree Crops. John Wiley and Sons, 1982.