APA (7th ed.) Zitazioa
ebrary, Inc, Tweeten, L. G., & Thompson, S. R. (2002). Agricultural policy for the 21st century. Iowa State Press.
Chicago Style (17th ed.) Zitazioa
ebrary, Inc, Luther G. Tweeten, eta Stanley R. Thompson. Agricultural Policy for the 21st Century. Ames: Iowa State Press, 2002.
MLA (9th ed.) Zitazioa
ebrary, Inc, et al. Agricultural Policy for the 21st Century. Iowa State Press, 2002.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.