Cita APA (7a ed.)

Hammonds, C., Woods, R. H., & Gregory, R. W. (1938). Today's agriculture. J.B. Lippincott company.

Cita Chicago Style (17a ed.)

Hammonds, Carsie, Ralph H. Woods, y R. W. Gregory. Today's Agriculture. Chicago, Philadelphia [etc.]: J.B. Lippincott company, 1938.

Cita MLA (8a ed.)

Hammonds, Carsie, et al. Today's Agriculture. J.B. Lippincott company, 1938.