Não informado. (1942). Machine tools. National Machine Tool Builders Association.
Chicago-viite (17. p.)Não informado. Machine Tools. Cleveland, Ohio: National Machine Tool Builders Association, 1942.
MLA-viite (8. p.)Não informado. Machine Tools. National Machine Tool Builders Association, 1942.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.