Cita APA

Smith, S., Diers, B., Specht, J., & Carver, B. (2014). Yield gains in major U.S. field crops. Volume 33. Madison, Wisconsin: American Society of Agronomy ; Crop Science Society of America ; Soil Science Society of America.

Citación estilo Chicago

Smith, Stephen,, Brian Diers, James Specht, y Brett Carver. Yield Gains in Major U.S. Field Crops. Volume 33. Madison, Wisconsin: American Society of Agronomy ; Crop Science Society of America ; Soil Science Society of America, 2014.

Cita MLA

Smith, Stephen,, Brian Diers, James Specht, y Brett Carver. Yield Gains in Major U.S. Field Crops. Volume 33. Madison, Wisconsin: American Society of Agronomy ; Crop Science Society of America ; Soil Science Society of America, 2014.