APA Format
Caldwell, John C.
; Okonjo, Chukuka
. (1968). The population of tropical Africa. London : Population Council
MLA Format
Caldwell, John C.; Okonjo, Chukuka
. The population of tropical Africa. London : Population Council, 1968
Australian/Harvard Format
Caldwell, John C.
; Okonjo, Chukuka
. 1968. The population of tropical Africa. Population Council, London
Warning: These citations may not always be 100% accurate.