Não informado. (2004). Farm machinery and equipment. National Retail Farm Equipment Association.
Chicago-viite (17. p.)Não informado. Farm Machinery and Equipment. Washington: National Retail Farm Equipment Association, 2004.
MLA-viite (8. p.)Não informado. Farm Machinery and Equipment. National Retail Farm Equipment Association, 2004.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.