Cita APA (7th ed.)

Richardson, J., & Zhang, C. (1999). Revealing comparative advantage: Chaotic or coherent patterns across time sector and U.S. trading partner. National Bureau of Economic Research.

Cita Chicago (17th ed.)

Richardson, J.D, i Chi Zhang. Revealing Comparative Advantage: Chaotic or Coherent Patterns Across Time Sector and U.S. Trading Partner. Cambridge: National Bureau of Economic Research, 1999.

Cita MLA (9th ed.)

Richardson, J.D, i Chi Zhang. Revealing Comparative Advantage: Chaotic or Coherent Patterns Across Time Sector and U.S. Trading Partner. National Bureau of Economic Research, 1999.