1. Stages of development in smallholder tree crop agriculture;BARLOW,1986
2. Fathers work for their sons: Accumulation, mobility and class formation in an extended Yoruba community;BERRY,1985
3. Property rights and rural resource management: the case of tree crops in West Africa;BERRY;Cah. des Sc. Hum. ORSTOM,1988
4. Social institutions and access to resources;BERRY;Africa,1989
5. The conditions of agricultural growth: The economics of agrarian change under population pressure;BOSERUP,1965