Sweet's Catalog Service. Plant engineering file. Sweet's Catalog Service.
Chicago-viite (17. p.)Sweet's Catalog Service. Plant Engineering File. New York: Sweet's Catalog Service.
MLA-viite (8. p.)Sweet's Catalog Service. Plant Engineering File. Sweet's Catalog Service.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.