Cita APA (7a ed.)

Keller, W. (1999). How trade patterns and technology flows affect productivity growth. National Bureau of Economic Research.

Cita Chicago Style (17a ed.)

Keller, Wolfgang. How Trade Patterns and Technology Flows Affect Productivity Growth. Cambridge: National Bureau of Economic Research, 1999.

Cita MLA (9a ed.)

Keller, Wolfgang. How Trade Patterns and Technology Flows Affect Productivity Growth. National Bureau of Economic Research, 1999.