ebrary, Inc, Tweeten, L. G., & Thompson, S. R. (2002). Agricultural policy for the 21st century. Iowa State Press.
Chicago-čujuhus (17. p.)ebrary, Inc, Luther G. Tweeten, juo Stanley R. Thompson. Agricultural Policy for the 21st Century. Ames: Iowa State Press, 2002.
MLA-čujuhus (9. p.)ebrary, Inc, et al. Agricultural Policy for the 21st Century. Iowa State Press, 2002.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.