Kepner, R. A., Bainer, R., & Barger, E. L. (1972). Principles of farm machinery (2nd ed.). Avi Pub.
Lua i Stíl Chicago (17ú heag.)Kepner, Robert Allen, Roy Bainer, agus E. L. Barger. Principles of Farm Machinery. 2nd ed. Westport, Conn: Avi Pub, 1972.
Lua MLA (9ú heag.)Kepner, Robert Allen, et al. Principles of Farm Machinery. 2nd ed. Avi Pub, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.