List of sources:
Draper, J.R. The engineers' contribution. A history of the South African Institution of Mechanical Engineers. Johannesburg, 1967.
Google scholar. http://scholar.google.co.za Patents by H.C. Behr.
Journal of the Chemical, Metallurgical and Mining Society of South Africa, 1904/5, Vol. 5, Members.
Journal of the Mechanical Engineers' Association of the Witwatersrand, 1903-1904, Vol. 2, paper by Behr.
Journal of the Transvaal Institute of Mechanical Engineers, 1905-1910, Vol. 4-8.
Men of the times: Pioneers of the Transvaal and glimpses of South Africa. Johannesburg: Transvaal Publishing Company, 1905.
National Union Catalogue, pre-1956 imprints. London: Mansell, 1968-1980.
Orr, J. Presidential address. Associated Scientific and Technical Societies of South Africa, Annual Proceedings, 1938, pp. 15-86.
Royal Society of South Africa. Transactions, 1908-1910, Vol. 1; 1917-1918, Vol. 6: Lists of fellows and members.
South African Association for the Advancement of Science. Report, 1903, 1905/6, 1910: Lists of members.
South African bibliography to the year 1925. London: Mansell, 1979.
South African who's who, 1908, 1909.
Transactions of the Institution of Mining and Metallurgy, eleventh session, 1901-1902, Vol. 11, Part 1(text) and Part 2 (plates), paper by Behr.
Williams, A.F. American engineers in South Africa. Kimberley, 1902.
Wills, W.H. Anglo-African who's who and biographical sketch book. London, 1910.