APA
Barker T., Liebhardt W. & Rieger S. (1985). Cropping system factors affecting the conversion from conventional to low-input farming. Madison, WI (USA): ASA.
Chicago
Barker T.C, Liebhardt W.L and Rieger S.L. 1985. Cropping system factors affecting the conversion from conventional to low-input farming. Madison, WI (USA): ASA.
Harvard
Barker T., Liebhardt W. and Rieger S. (1985). Cropping system factors affecting the conversion from conventional to low-input farming. Madison, WI (USA): ASA.
MLA
Barker T.C, Liebhardt W.L and Rieger S.L. Cropping system factors affecting the conversion from conventional to low-input farming. Madison, WI (USA): ASA. 1985.
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