Geskrewe getuienis: Naturelle Onderwys, voor die Naturelle Ekonomiese Kommissie / Written evidence: Native Education, presented to the Native Economic Commission. Volume 10. (1930-1931)
South African Native Economic Commission(2012-08-27)
Geskrewe getuienis voor die Naturelle Ekonomiese Kommissie / Written evidence presented to the Native Economic Commission Volume 8: Native Tax & Industrial Relations (1930-1931).
Roberts, A.W.; Van Til, H.A.; Hart, F.S.; Snyman, M.P.; Van Alpen, J.G.; Du Plessis, M.C.; Wagner, H.C.C.; Marais, Benjamin; Budd, Charles Arthur(2012-08-27)
Geskrewe getuienis voor die Naturelle Ekonomiese Kommissie : Knysna, Graaff-Reinet, Gordonia / Written evidence for the Native Economic Commission, 1931.