APA (7th ed.) Citation

Earle, E. M. (1921). An outline of modern history: A syllabus with map studies. The Macmillan Company.

Chicago Style (17th ed.) Citation

Earle, Edward Mead. An Outline of Modern History: A Syllabus with Map Studies. New York: The Macmillan Company, 1921.

MLA (9th ed.) Citation

Earle, Edward Mead. An Outline of Modern History: A Syllabus with Map Studies. The Macmillan Company, 1921.