Cita APA (7a ed.)

Cowan, J., & Robertson,L.S. (1969). International agronomy training and education. Américan Society of AgronomyCrop Science of AméricaSoil Science Society of América.

Cita Chicago Style (17a ed.)

Cowan, J.Ritchie, y Robertson,L.S. International Agronomy Training and Education. Madison, Wisconsin: Américan Society of AgronomyCrop Science of AméricaSoil Science Society of América, 1969.

Cita MLA (8a ed.)

Cowan, J.Ritchie, y Robertson,L.S. International Agronomy Training and Education. Américan Society of AgronomyCrop Science of AméricaSoil Science Society of América, 1969.