Cita APA (7a ed.)

Olmstead, A. L., & Rhode, P. W. (2002). The red queen and the hard reds: Productivity growth in American wheat, 1800-1940. National Bureau of Economic Research.

Cita Chicago Style (17a ed.)

Olmstead, Alan L., y Paul Webb Rhode. The Red Queen and the Hard Reds: Productivity Growth in American Wheat, 1800-1940. Cambridge, MA: National Bureau of Economic Research, 2002.

Cita MLA (9a ed.)

Olmstead, Alan L., y Paul Webb Rhode. The Red Queen and the Hard Reds: Productivity Growth in American Wheat, 1800-1940. National Bureau of Economic Research, 2002.