APA (7th ed.) Citation

Ledig, P. G., & Weaver, E. R. (1923). Detector for water vapor in closed pipes. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

Ledig, P. G., and Elmer R. Weaver. Detector for Water Vapor in Closed Pipes. [Washington?]: U.S. Government Printing Office, 1923.

MLA (9th ed.) Citation

Ledig, P. G., and Elmer R. Weaver. Detector for Water Vapor in Closed Pipes. U.S. Government Printing Office, 1923.