Heer, F. (1962). The medieval world: Europe. New American Library.
Chicagoスタイル(17版)引用形式Heer, Friedrich. The Medieval World: Europe. New York: New American Library, 1962.
MLA(9版)引用形式Heer, Friedrich. The Medieval World: Europe. New American Library, 1962.
警告: この引用は必ずしも正確ではありません.