Rycroft, David (1992). "Professor Ernest Oswald Johannes Westphal (1919-1990)". African Languages and Cultures. 5 (1). Taylor & Francis, Ltd.: 91–95. doi:10.1080/09544169208717746. JSTOR1771802.
Rycroft, David (1992). "Professor Ernest Oswald Johannes Westphal (1919-1990)". African Languages and Cultures. 5 (1). Taylor & Francis, Ltd.: 91–95. doi:10.1080/09544169208717746. JSTOR1771802.
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Philip, Marie (1971). Gregory. Jackass Penguin. Cape Town: D. Philip. OCLC516793.
Philip, Marie; Naudé, Adèle (1971). Gregory. Jackass Penguin. Cape Town: D. Philip. OCLC934935912.