Gaya APA

A, S., B, T. (1986). No-Tillage and Surface-Tillage Agriculture The Tillage Revolution . New York: John Wiley and Sons,.

Gaya MLA

A, Sprague,Milton., B, Triplett,Glover. "No-Tillage and Surface-Tillage Agriculture The Tillage Revolution". New York: John Wiley and Sons,, 1986. Text.