Reversing the spiral : the population, agriculture and environment nexus in Sub- Saharan Africa. - Cleaven, K.M. and Schreiber, G. (Washington, D.C. The world bank, 1994)
Keywords: Human ecology - Africa, Sub - Saharan; agriculture and state - Africa, Sub - Saharan; agriculture - environmental aspects - Africa, Sub - Saharan; Africa, Sub- Saharan - economic conditions - 1960