APA (7th ed.) Citation

(1927). Brown-Duvel moisture tester and how to operate it. GPO.

Chicago Style (17th ed.) Citation

Brown-Duvel Moisture Tester and How to Operate It. [Washington]: GPO, 1927.

MLA (9th ed.) Citation

Brown-Duvel Moisture Tester and How to Operate It. GPO, 1927.