APA (7th ed.) Citation

Wiggin, K. D. S., & Smith, N. A. (2006). Tales of Wonder Every Child Should Know. Project Gutenberg.

Chicago Style (17th ed.) Citation

Wiggin, Kate Douglas Smith, and Nora Archibald Smith. Tales of Wonder Every Child Should Know. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Wiggin, Kate Douglas Smith, and Nora Archibald Smith. Tales of Wonder Every Child Should Know. Project Gutenberg, 2006.

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