APA (7e ed.) Bronvermelding

Ingram, G. K., & Liu, Z. (1998). Vehicles, roads, and road use: Alternative empirical specifications. World Bank.

Chicago (17e ed.) Bronvermelding

Ingram, Gregory K., en Zhi Liu. Vehicles, Roads, and Road Use: Alternative Empirical Specifications. Washington, D.C: World Bank, 1998.

MLA (9e ed.) Bronvermelding

Ingram, Gregory K., en Zhi Liu. Vehicles, Roads, and Road Use: Alternative Empirical Specifications. World Bank, 1998.