APA (7th ed.) Citation

(1922). Instructions for using cipher device, type M-94. GPO.

Chicago Style (17th ed.) Citation

Instructions for Using Cipher Device, Type M-94. [Washington]: GPO, 1922.

MLA (9th ed.) Citation

Instructions for Using Cipher Device, Type M-94. GPO, 1922.

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