Yeager, Rodger
Tanzania : an African experiment
Westview Press, 1989
Buku Teks SO
Moisture availability and agricultural potentialities of Mali and Niger
Artikel Jurnal
Yudelman, Montague
Africans on the land : economic problems of african agricultural development in Southeren,Central, and East Afric, Whit special reference to Southern Rhodesia
Harvard University Press , 1975
Buku Teks
Agricultural development in modern Japan
edited by Takekazu Ogura
Fuji Publishing, 1967
Buku Teks
Mellor, John W.
The economics of agricultural development
Cornell University Press, 1966
Buku Teks