Não informado. (1918). National Bureau of Standards Handbook. Government Printing Office.
Chicago-viite (17. p.)Não informado. National Bureau of Standards Handbook. Washington: Government Printing Office, 1918.
MLA-viite (8. p.)Não informado. National Bureau of Standards Handbook. Government Printing Office, 1918.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.