APA (7th ed.) Citation

Helble, M., & Okubo, T. (2008). Heterogeneous Quality Firms And Trade Costs. The World Bank.

Chicago Style (17th ed.) Citation

Helble, Matthias, and Toshihiro Okubo. Heterogeneous Quality Firms And Trade Costs. Washington, D.C: The World Bank, 2008.

MLA (8th ed.) Citation

Helble, Matthias, and Toshihiro Okubo. Heterogeneous Quality Firms And Trade Costs. The World Bank, 2008.