Cita APA

Dregne, H. E., & Willis, W. O. (1983). Dryland agriculture. American Society of Agronomy.

Citación estilo Chicago

Dregne, H. E., and Wayne O. Willis. Dryland Agriculture. Madison, Wis.: American Society of Agronomy, 1983.

Cita MLA

Dregne, H. E., and Wayne O. Willis. Dryland Agriculture. Madison, Wis.: American Society of Agronomy, 1983.