Upadhya, D. R. (1975). Transit trade of land-locked states. Instittue of Social Studies.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUpadhya, Devendra Raj. Transit Trade of Land-locked States. The Hague: Instittue of Social Studies, 1975.
एमएलए (9वां संस्करण) प्रशस्ति पत्रUpadhya, Devendra Raj. Transit Trade of Land-locked States. Instittue of Social Studies, 1975.
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