APA (7th ed.) Citation

Irwin, R. B. (2008). History of the Nineteenth Army Corps. Project Gutenberg.

Chicago Style (17th ed.) Citation

Irwin, Richard B. History of the Nineteenth Army Corps. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Irwin, Richard B. History of the Nineteenth Army Corps. Project Gutenberg, 2008.

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