Delgado, C. L. (1978). An investigation of the lack of mixed farming in the West African Savannah: A farming systems approach for Tenkodogo, Upper Volta. Center for Research on Economic Development, University of Michigan.

Delgado, Christopher Linn. An Investigation of the Lack of Mixed Farming in the West African Savannah: A Farming Systems Approach for Tenkodogo, Upper Volta. Ann Arbor: Center for Research on Economic Development, University of Michigan, 1978.

Delgado, Christopher Linn. An Investigation of the Lack of Mixed Farming in the West African Savannah: A Farming Systems Approach for Tenkodogo, Upper Volta. Center for Research on Economic Development, University of Michigan, 1978.