APA
(1993). The persisting ecological constraints of tropical agriculture. Harlow, Essex, England: Longman Scientific & Technical.
Chicago
1993. The persisting ecological constraints of tropical agriculture. Harlow, Essex, England: Longman Scientific & Technical.
Harvard
(1993). The persisting ecological constraints of tropical agriculture. Harlow, Essex, England: Longman Scientific & Technical.
MLA
The persisting ecological constraints of tropical agriculture. Harlow, Essex, England: Longman Scientific & Technical. 1993.