APA (7th ed.) Citation

De Beer, G. (1955). Alps and elephants: Hannibal's march. G. Bles.

Chicago Style (17th ed.) Citation

De Beer, Gavin. Alps and Elephants: Hannibal's March. London: G. Bles, 1955.

MLA (9th ed.) Citation

De Beer, Gavin. Alps and Elephants: Hannibal's March. G. Bles, 1955.