Køppen, A. L. (1854). The world in the middle ages: An historical geography, with accounts of the origin and development, the institutions and literature, the manners and customs of three nations in Europe, western Asia, and northern Africa, from the close of the fourth to the middle of the fifteenth century. D. Appleton and company.
Chicago Style (17th ed.) CitationKøppen, Adolph Ludvig. The World in the Middle Ages: An Historical Geography, with Accounts of the Origin and Development, the Institutions and Literature, the Manners and Customs of Three Nations in Europe, Western Asia, and Northern Africa, from the Close of the Fourth to the Middle of the Fifteenth Century. New York [etc.]: D. Appleton and company, 1854.
MLA (8th ed.) CitationKøppen, Adolph Ludvig. The World in the Middle Ages: An Historical Geography, with Accounts of the Origin and Development, the Institutions and Literature, the Manners and Customs of Three Nations in Europe, Western Asia, and Northern Africa, from the Close of the Fourth to the Middle of the Fifteenth Century. D. Appleton and company, 1854.