APA (7th ed.) Citation

Smith, F. H., Yohn, F. C., & Keller, A. I. (2009). Colonel Carter's Christmas and The Romance of an Old-Fashioned Gentleman. Project Gutenberg.

Chicago Style (17th ed.) Citation

Smith, Francis Hopkinson, F. C. Yohn, and Arthur Ignatius Keller. Colonel Carter's Christmas and The Romance of an Old-Fashioned Gentleman. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Smith, Francis Hopkinson, et al. Colonel Carter's Christmas and The Romance of an Old-Fashioned Gentleman. Project Gutenberg, 2009.

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