APA aipamena

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

Chicago Style aipamena

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 aipamena

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