Não informado. (1931). Journal of the Rubber Research Institute of Malaya. Rubber Research Institute of Malaysia.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Journal of the Rubber Research Institute of Malaya. Kuala Lumpur: Rubber Research Institute of Malaysia, 1931.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Journal of the Rubber Research Institute of Malaya. Rubber Research Institute of Malaysia, 1931.
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