Keller, W. How trade patterns and technology flows affect productivity growth. World Bank.
Lua i Stíl Chicago (17ú heag.)Keller, Wolfgang. How Trade Patterns and Technology Flows Affect Productivity Growth. Washington, DC: World Bank.
Lua MLA (9ú heag.)Keller, Wolfgang. How Trade Patterns and Technology Flows Affect Productivity Growth. World Bank.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.