APA
Williams C. N., Chew W. Y. & Rajaratnam J. H. (1980). Tree and field crops of the wetter regions of the tropics. London: Longman.
Chicago
Williams C N, Chew W Y and Rajaratnam J H. 1980. Tree and field crops of the wetter regions of the tropics. London: Longman.
Harvard
Williams C. N., Chew W. Y. and Rajaratnam J. H. (1980). Tree and field crops of the wetter regions of the tropics. London: Longman.
MLA
Williams C N, Chew W Y and Rajaratnam J H. Tree and field crops of the wetter regions of the tropics. London: Longman. 1980.