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
Patterns of African development : five comparisons
edited by Herbert J. Spiro
Prentice-Hall, 1967
Buku Teks SO
Agricultural development in modern Japan
edited by Takekazu Ogura
Fuji Publishing, 1967
Buku Teks