APA (7th ed.) Citation

Elson, H. W. (1889). Side lights on American history. Macmillan.

Chicago Style (17th ed.) Citation

Elson, Henry William. Side Lights on American History. New York: Macmillan, 1889.

MLA (9th ed.) Citation

Elson, Henry William. Side Lights on American History. Macmillan, 1889.