Gaya APA

Hoeft, R, G. (1992). Journal of Production agriculture (Vol. 5,--No. 2). St. Paul Minnesta: American Society of Agronomy Crop Science Society of America.

Gaya MLA

Hoeft, Robert, G.. "Journal of Production agriculture". Vol. 5,--No. 2 St. Paul Minnesta: American Society of Agronomy Crop Science Society of America, 1992. Text.