APA
Hoyt R., . (1957). Europe in the Middle Ages. New York: Harcourt, Brace and World,Inc.
Chicago
Hoyt R.S, . 1957. Europe in the Middle Ages. New York: Harcourt, Brace and World,Inc.
Harvard
Hoyt R., . (1957). Europe in the Middle Ages. New York: Harcourt, Brace and World,Inc.
MLA
Hoyt R.S, . Europe in the Middle Ages. New York: Harcourt, Brace and World,Inc. 1957.
