MLA

Callahan, Patricia. An Iowa Farmer Depends On Pesticides. His Son Asks: Is There a Better Way?. USA, 2015.

APA

Callahan, P. (2015). An Iowa farmer depends on pesticides. His son asks: Is there a better way?. USA.

Chicago

Callahan, Patricia An Iowa Farmer Depends On Pesticides. His Son Asks: Is There a Better Way?. USA, 2015.