APA (7th ed.) Citation

Beard, C. A. (1927). An introduction to the English historians. Macmillan.

Chicago Style (17th ed.) Citation

Beard, Charles A. An Introduction to the English Historians. New York: Macmillan, 1927.

MLA (9th ed.) Citation

Beard, Charles A. An Introduction to the English Historians. Macmillan, 1927.