APA (7th ed.) Citation

Sue, E., & De Leon, D. (2010). The Carlovingian Coins Or The Daughters of Charlemagne. A Tale of the Ninth Century. Project Gutenberg.

Chicago Style (17th ed.) Citation

Sue, Eugène, and Daniel De Leon. The Carlovingian Coins Or The Daughters of Charlemagne. A Tale of the Ninth Century. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Sue, Eugène, and Daniel De Leon. The Carlovingian Coins Or The Daughters of Charlemagne. A Tale of the Ninth Century. Project Gutenberg, 2010.

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