Snyder, L. U. (2010). Introduction to crop production. Stipes Publishing L.L.C.
Chicago Style aipamenaSnyder, Lori Unruh. Introduction to Crop Production. [Place of publication not identified]: Stipes Publishing L.L.C, 2010.
MLA aipamenaSnyder, Lori Unruh. Introduction to Crop Production. Stipes Publishing L.L.C, 2010.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.