APA (7th ed.) Citation

(1931). Bell-bottom screw jacks. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

Bell-bottom Screw Jacks. [Washington?]: U.S. Government Printing Office, 1931.

MLA (9th ed.) Citation

Bell-bottom Screw Jacks. U.S. Government Printing Office, 1931.

Warning: These citations may not always be 100% accurate.