APA (7th ed.) Citation

Henderson, K. (2005). Letters to Helen: Impressions of an Artist on the Western Front. Project Gutenberg.

Chicago Style (17th ed.) Citation

Henderson, Keith. Letters to Helen: Impressions of an Artist on the Western Front. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Henderson, Keith. Letters to Helen: Impressions of an Artist on the Western Front. Project Gutenberg, 2005.

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