Citazione Stile APA (7a Edizione)

Unstead, R. J. (1972). From Cavemen to Vikings (2. ed.). Black.

Citazione stile Chigago Style (17a edizione)

Unstead, R. J. From Cavemen to Vikings. 2. ed. London: Black, 1972.

Citatione MLA (9a ed.)

Unstead, R. J. From Cavemen to Vikings. 2. ed. Black, 1972.