APA (7th ed.) Citation

Hargreaves, R. (1948). The enemy at the gate: A book of famous sieges, their causes, their progress and their consequences. Military Service Pub. Co..

Chicago Style (17th ed.) Citation

Hargreaves, Reginald. The Enemy at the Gate: A Book of Famous Sieges, Their Causes, Their Progress and Their Consequences. Harrisburg, Pa.: Military Service Pub. Co., 1948.

MLA (9th ed.) Citation

Hargreaves, Reginald. The Enemy at the Gate: A Book of Famous Sieges, Their Causes, Their Progress and Their Consequences. Military Service Pub. Co., 1948.