APA (7th ed.) Citation

Guelzo, A. C. (2013). Gettysburg: The last invasion.

Chicago Style (17th ed.) Citation

Guelzo, Allen C. Gettysburg: The Last Invasion. 2013.

MLA (8th ed.) Citation

Guelzo, Allen C. Gettysburg: The Last Invasion. 2013.

Warning: These citations may not always be 100% accurate.