APA (7th ed.) Citation

Orpen, W. (2006). An Onlooker in France 1917-1919. Project Gutenberg.

Chicago Style (17th ed.) Citation

Orpen, William. An Onlooker in France 1917-1919. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Orpen, William. An Onlooker in France 1917-1919. Project Gutenberg, 2006.

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