Não informado. (1928). Instruments: The magazine of measurement and control. Instruments Publishing.
Lua i Stíl Chicago (17ú heag.)Não informado. Instruments: The Magazine of Measurement and Control. Pontiac, Ill: Instruments Publishing, 1928.
Lua MLA (8ú heag.)Não informado. Instruments: The Magazine of Measurement and Control. Instruments Publishing, 1928.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.