APA (7th ed.) Citation

Crouch, L. W. (1917). Duty and service: Letters from the front. [publisher not identified].

Chicago Style (17th ed.) Citation

Crouch, Lionel William. Duty and Service: Letters from the Front. [Place of publication not identified]: [publisher not identified], 1917.

MLA (9th ed.) Citation

Crouch, Lionel William. Duty and Service: Letters from the Front. [publisher not identified], 1917.