APA

Butterfield H., . (19521951). History and human relations. New York: Macmillan.

Chicago

Butterfield Herbert, . 19521951. History and human relations. New York: Macmillan.

Harvard

Butterfield H., . (19521951). History and human relations. New York: Macmillan.

MLA

Butterfield Herbert, . History and human relations. New York: Macmillan. 19521951.