Cita APA (7a ed.)
Pirenne, H., & Halsey, F. D. (1925). Medieval cities: Their origins and the revival of trade. Doubleday.
Cita Chicago Style (17a ed.)
Pirenne, Henri, y Frank D. Halsey. Medieval Cities: Their Origins and the Revival of Trade. New York: Doubleday, 1925.
Cita MLA (9a ed.)
Pirenne, Henri, y Frank D. Halsey. Medieval Cities: Their Origins and the Revival of Trade. Doubleday, 1925.
Precaución: Estas citas no son 100% exactas.