Não informado. (1928). Instruments: The magazine of measurement and control. Instruments Publishing.
Chicago-referens (17:e uppl.)Não informado. Instruments: The Magazine of Measurement and Control. Pontiac, Ill: Instruments Publishing, 1928.
MLA-referens (8:e uppl.)Não informado. Instruments: The Magazine of Measurement and Control. Instruments Publishing, 1928.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.