APA (7th ed.) Citation

Olmstead, A. L., & Rhode, P. W. (2000). The diffusion of the tractor in American agriculture: 1910-60. National Bureau of Economic Research.

Chicago Style (17th ed.) Citation

Olmstead, Alan L., and Paul Webb Rhode. The Diffusion of the Tractor in American Agriculture: 1910-60. Cambridge: National Bureau of Economic Research, 2000.

MLA (9th ed.) Citation

Olmstead, Alan L., and Paul Webb Rhode. The Diffusion of the Tractor in American Agriculture: 1910-60. National Bureau of Economic Research, 2000.