STONE, A. A., & GULVIN, H. E. (1977). Machines for power farming.-- 3rd ed. John Wiley and Sons.
Lua i Stíl Chicago (17ú heag.)STONE, Archie A., agus Harold E. GULVIN. Machines for Power Farming.-- 3rd Ed. New York: John Wiley and Sons, 1977.
Lua MLA (9ú heag.)STONE, Archie A., agus Harold E. GULVIN. Machines for Power Farming.-- 3rd Ed. John Wiley and Sons, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.