List of sources:
Cape of Good Hope. Report of the committee of the Albany Museum, 1897-1908.
Cape of Good Hope. Report of the trustees of the South African Museum, 1876.
Cohen, A. Mary Elizabeth Barber, the Bowkers and South African prehistory. South African Archaeological Bulletin, 1999, Vol. 54, pp. 120-127.
Dictionary of South African biography, Vol. 2, 1972.
Geological Society of South Africa. Transactions, 1897, Vol. 2, list of members.
Men of the times: Pioneers of the Transvaal and glimpses of South Africa. Johannesburg: Transvaal Publishing Company, 1905.
Trimen, Roland. South African butterflies: A monograph of the extra-tropical species (3 vols). London: Truebner & Co., 1887-1889.
Venter, R.J. Bibliography of regional meteorological literature. Vol. 1. Southern Africa, 1486-1948. Pretoria: Weather Bureau, 1949.