Cita APA (7a ed.)

Cassady, R. F., & Norwich, J. J. (1986). The Norman achievement. Sidgwick & Jackson.

Cita Chicago Style (17a ed.)

Cassady, Richard F., y John Julius Norwich. The Norman Achievement. London: Sidgwick & Jackson, 1986.

Cita MLA (9a ed.)

Cassady, Richard F., y John Julius Norwich. The Norman Achievement. Sidgwick & Jackson, 1986.