Cita APA (7th ed.)

Müller, G. (1990). Kreuzzüge - Leo XIII. de Gruyter.

Cita Chicago (17th ed.)

Müller, Gerhard. Kreuzzüge - Leo XIII. Berlin [u.a.]: de Gruyter, 1990.

Cita MLA (8th ed.)

Müller, Gerhard. Kreuzzüge - Leo XIII. de Gruyter, 1990.