J., R., F.(1991).National and regional self-sufficiency goals : implications for international agriculture / editor, Fred J. Ruppel, Earl D. Kellog .:L. Rienner.
Gaya MLA
Ruppel, Fred, J.."National and regional self-sufficiency goals : implications for international agriculture / editor, Fred J. Ruppel, Earl D. Kellog".:L. Rienner,1991.Textbook.