Cita APA (7a ed.)

Gillingham, J. (1980). Richard I and Berengaria of Navarre. [s.n.].

Cita Chicago Style (17a ed.)

Gillingham, John. Richard I and Berengaria of Navarre. [S.l.]: [s.n.], 1980.

Cita MLA (9a ed.)

Gillingham, John. Richard I and Berengaria of Navarre. [s.n.], 1980.