Coetzee, J A G. Rhodes University; 1964. An investigation of the role of conflict in the stratificationary process of the African in the copper mining industry of Northern Rhodesia between the years, 1943-1961.

Coetzee, J A G. Rhodes University; 1968. An investigation into the components of motivation so far as these determine employee stability and work satisfaction amongst Europeans and Africans engaged in the same occupational grading in the copper mining industry of Zambia.