APA (7th ed.) Citation

Sawyer, C. W. (1910). Firearms in American history. Published by the author.

Chicago Style (17th ed.) Citation

Sawyer, Charles Winthrop. Firearms in American History. Boston, U.S.A.: Published by the author, 1910.

MLA (9th ed.) Citation

Sawyer, Charles Winthrop. Firearms in American History. Published by the author, 1910.