Dyfyniad APA

Lim-ao, N., & Venables, A. (1999). Infrastructure, geographical disadvantage and transport costs. Trade, Development Research Group, World Bank.

Dyfyniad Arddull Chicago

Lim-ao, Nuno, and Anthony Venables. Infrastructure, Geographical Disadvantage and Transport Costs. Washington, D.C: Trade, Development Research Group, World Bank, 1999.

Dyfyniad MLA

Lim-ao, Nuno, and Anthony Venables. Infrastructure, Geographical Disadvantage and Transport Costs. Trade, Development Research Group, World Bank, 1999.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.