APA (7th ed.) Citation

Preston, T. (2012). Dictionary of English Proverbs and Proverbial Phrases With a Copious Index of Principal Words. Project Gutenberg.

Chicago Style (17th ed.) Citation

Preston, Thomas. Dictionary of English Proverbs and Proverbial Phrases With a Copious Index of Principal Words. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Preston, Thomas. Dictionary of English Proverbs and Proverbial Phrases With a Copious Index of Principal Words. Project Gutenberg, 2012.

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