Cita APA (7a ed.)

Gerhard, D. (1981). Old Europe: A study of continuity, 1000-1800. Academic Press.

Cita Chicago Style (17a ed.)

Gerhard, Dietrich. Old Europe: A Study of Continuity, 1000-1800. New York [etc.]: Academic Press, 1981.

Cita MLA (9a ed.)

Gerhard, Dietrich. Old Europe: A Study of Continuity, 1000-1800. Academic Press, 1981.