Não informado. (1919). Memoirs of the Botanical Survey of South Africa. Department of Agricultural Technical Services, Botanical Research.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Memoirs of the Botanical Survey of South Africa. Pretoria, Africa do Sul: Department of Agricultural Technical Services, Botanical Research, 1919.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Memoirs of the Botanical Survey of South Africa. Department of Agricultural Technical Services, Botanical Research, 1919.
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