Gaya APA

Servic, A, E, L, R, R, D, L, A, O, S, U, C, E. (1990). An Economic Comparison of Tillage Systems . : .

Gaya MLA

Servic, Allan, E., Lines;, Randall, Reeder;, Darrel, L., Acker;, Ohio, State, University., Cooperative, Extension. "An Economic Comparison of Tillage Systems". : , 1990. Text.