MLA

Machiavelli, Niccolò. The Prince / Niccolò Machiavelli; Transl. with an Introd. by George Bull. Harmondsworth, 1961.

APA

Machiavelli, N. (1961). The prince / Niccolò Machiavelli; transl. with an introd. by George Bull. Harmondsworth.

Chicago

Machiavelli, Niccolò The Prince / Niccolò Machiavelli; Transl. with an Introd. by George Bull. Harmondsworth, 1961.