APA (7th ed.) Citation

Smith, E. E., & Francis, D. (2007). The Blue Tower. Project Gutenberg.

Chicago Style (17th ed.) Citation

Smith, Evelyn E., and Dick Francis. The Blue Tower. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Smith, Evelyn E., and Dick Francis. The Blue Tower. Project Gutenberg, 2007.

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