APA (7th ed.) Citation

Firth, C. F., & Firth, C. B. (1965). From Napoleon to Hitler (Reference book, 14. impression.). Ginn.

Chicago Style (17th ed.) Citation

Firth, Caterhine F., and Catherine B. Firth. From Napoleon to Hitler. Reference book, 14. impression. London: Ginn, 1965.

MLA (9th ed.) Citation

Firth, Caterhine F., and Catherine B. Firth. From Napoleon to Hitler. Reference book, 14. impression. Ginn, 1965.