APA

Gies F., Gies J., . (1987). Marriage and the family in the middle ages. New York: Harper Row.

Chicago

Gies Frances, Gies Joseph, . 1987. Marriage and the family in the middle ages. New York: Harper Row.

Harvard

Gies F., Gies J., . (1987). Marriage and the family in the middle ages. New York: Harper Row.

MLA

Gies Frances, Gies Joseph, . Marriage and the family in the middle ages. New York: Harper Row. 1987.