Cita APA (7a ed.)

Unstead, R. J. (1972). The Middle Ages (2. ed.). Black.

Cita Chicago Style (17a ed.)

Unstead, R. J. The Middle Ages. 2. ed. London: Black, 1972.

Cita MLA (9a ed.)

Unstead, R. J. The Middle Ages. 2. ed. Black, 1972.