1. Social and Economic Planning Council Report No.10(U.G. 37–46) ( Union of South Africa , Cape Town , 1946 ), p. 27
2. Cortis, L., Welch, P., Blake, R., Skawran, R. and van Rooyen, J. 1962.The Utilization of Bantu Labour in the Building Industry, 10–12. Johannesburg: National Development Fund for the Building Industry.
3. P., Scheiner, 1976.‘The Occupational Mobility of Black Workers in the Witwatersrand Building Industry from I960 with Some Reference to the Occupational Mobility of the Coloured People in the Western Cape Building Industry’, 81Rondebosch: University of Cape Town. (Unpublished Masters Thesis