Yeager, Rodger
Tanzania : an African experiment
Westview Press, 1989
Buku Teks
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
Institutions in agricultural development
edited by Melvin G. Blase
Iowa State University Press, 1971
Buku Teks
Norton, George W.
Introduction to economics of agricultural development
McGraw-Hill, 1993
Buku Teks