List of sources:
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Jansen, B.C. In Memoriam. Dr Petrus Johann du Toit. Suid-Afrikaanse Akademie vir Wetenskap en Kuns, Jaarboek, 1968, pp. 83-84.
Kingwell, D.G. & Schonland, B.J.F. Petrus Johann du Toit, 1888-1951. Bibliographical Memoirs of Fellows of the Royal Society, 1969, Vol. 15, pp. 246-266.
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South African Journal of Science, 1934, Vol. 31, pp. xxvi-xxix: Twenty-fourth award of the South Africa medal and grant [to Dr P.J. du Toit].
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University of the Witwatersrand. Honorary Graduates. http://www.wits.ac.za/alumni/alumnirecognition/3600/honorary_degrees.html