APA (7th ed.) Citation

Horler, S. (1950). The enemy within the gates. Hodder & Stoughton.

Chicago Style (17th ed.) Citation

Horler, Sydney. The Enemy Within the Gates. London: Hodder & Stoughton, 1950.

MLA (8th ed.) Citation

Horler, Sydney. The Enemy Within the Gates. Hodder & Stoughton, 1950.

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