Cita APA

Philipp, P. F., Schmehl, W. R., & Shaner, W. W. (1982). Farming systems research and development. West view press.

Chicago Edition Citation

Philipp, P F., W R. Schmehl, i W W. Shaner. Farming Systems Research and Development. Colorado: West view press, 1982.

Cita MLA

Philipp, P F., et al. Farming Systems Research and Development. West view press, 1982.