APA (7th ed.) Citation

Wheatley, H. B. (2012). How to Make an Index. Project Gutenberg.

Chicago Style (17th ed.) Citation

Wheatley, Henry B. How to Make an Index. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Wheatley, Henry B. How to Make an Index. Project Gutenberg, 2012.

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