Gaya APA

GIBBON, D., PAIN, A. (1988). Crops of the Drier Regions of the Tropics . Singapore: Longman Scentific & Tehnical.

Gaya MLA

GIBBON, DAVID., PAIN, ADAM. "Crops of the Drier Regions of the Tropics". Singapore: Longman Scentific & Tehnical, 1988. Text.