1. "Preliminary note on the ancient human skull remains from the Transvaal.” Trans. of the Roy. Soc. of S.A. Vol. vi. Pt. I. 1917.
2. "The evidence afforded by the Boskop skull of a new species of primitive man (Homo capensis).” Anthrop. papers of the Amer. Mus. of Nat. Hist. Vol. xxiii., Pt. II. 1918.
3. "The Stone Ages of South Africa,” etc. Annals of the South African Museum. Vol. viii. July 5, 1911.