Cita APA

Heer, F. 1., & Sondheimer, J. (1962). The medieval world: Europe 1100-1350. New York, NY: The New American Library.

Citación estilo Chicago

Heer, Friedrich 1916-, y Janet Sondheimer. The Medieval World: Europe 1100-1350. New York, NY: The New American Library, 1962.

Cita MLA

Heer, Friedrich 1916-, y Janet Sondheimer. The Medieval World: Europe 1100-1350. New York, NY: The New American Library, 1962.