APA (7th ed.) Citation

Hardy, T. (2010). Two on a tower. Project Gutenberg.

Chicago Style (17th ed.) Citation

Hardy, Thomas. Two on a Tower. To be supplied: Project Gutenberg, 2010.

MLA (8th ed.) Citation

Hardy, Thomas. Two on a Tower. Project Gutenberg, 2010.

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