List of sources:
Cape of Good Hope. Report of the trustees of the South African Museum, 1908, 1909.
FamilySearch: Albert Richard E. Walker. https://www.familysearch.org/en/tree/person/details/L4HH-VLF
Fuller, A.O. University of Cape Town. In C.R. Anhaeusser (ed.), A century of geological endeavour in southern Africa, 1895-1995 (pp. 181-190). Johannesburg: Geological Society of South Africa, 1997.
Google scholar. http://scholar.google.co.za/
Hall, A.L. A bibliography of South African geology.... Pretoria: Geological Survey, Memoirs No. 25 (1927) and No. 27 (1931).
National Automated Archival Information Retrieval System (NAAIRS). http://national.archives.gov.za/naairs.htm Documents relating to Walker, Albert Richard Edgington.
Phillips, H. The University of Cape Town, 1918-1948: The formative years. University of Cape Town, 1993.
Ritchie, W. The history of the South African College, 1829-1918. Cape Town: T. Maskew Miller, 1918.
Royal Society of South Africa. Transactions, 1908-1922, Vol. 1, 4, 6 and 10.
Summers, R.F.H. A history of the South African Museum, 1825-1975. Cape Town: Balkema, 1975.
Union of South Africa. Report of the South African Museum for the years 1910, 1911, 1912. Cape Town, 1913.
University of the Cape of Good Hope. Calendar, 1912/13.