Nijman, V. (2009). An assessment of trade in gibbons and orang-utans in Sumatra, Indonesia. TRAFFIC Southeast Asia.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNijman, Vincent. An Assessment of Trade in Gibbons and Orang-utans in Sumatra, Indonesia. Petaling Jaya, Selangor, Malaysia: TRAFFIC Southeast Asia, 2009.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNijman, Vincent. An Assessment of Trade in Gibbons and Orang-utans in Sumatra, Indonesia. TRAFFIC Southeast Asia, 2009.
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