Ingram, G. K., & Liu, Z. (1999). Determinants of motorization and road provision. Transport Division, Research Advisory Staff and Transport, Water and Urban Development Department, World Bank.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रIngram, Gregory K., और Zhi Liu. Determinants of Motorization and Road Provision. Washington, D.C: Transport Division, Research Advisory Staff and Transport, Water and Urban Development Department, World Bank, 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्रIngram, Gregory K., और Zhi Liu. Determinants of Motorization and Road Provision. Transport Division, Research Advisory Staff and Transport, Water and Urban Development Department, World Bank, 1999.
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