(1981). North and West Sumatra: An industry perspective of tourism development. PATA.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNorth and West Sumatra: An Industry Perspective of Tourism Development. San Francisco: PATA, 1981.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNorth and West Sumatra: An Industry Perspective of Tourism Development. PATA, 1981.
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