APA-viite (7. p.)
Pirenne, H., & Halsey, F. D. (1925). Medieval cities: Their origins and the revival of trade. Doubleday.
Chicago-viite (17. p.)
Pirenne, Henri, ja Frank D. Halsey. Medieval Cities: Their Origins and the Revival of Trade. New York: Doubleday, 1925.
MLA-viite (9. p.)
Pirenne, Henri, ja Frank D. Halsey. Medieval Cities: Their Origins and the Revival of Trade. Doubleday, 1925.
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