APA (7th ed.) Citation

Wiggin, K. D. S., & Smith, N. A. (2010). Froebel's Gifts. Project Gutenberg.

Chicago Style (17th ed.) Citation

Wiggin, Kate Douglas Smith, and Nora Archibald Smith. Froebel's Gifts. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Wiggin, Kate Douglas Smith, and Nora Archibald Smith. Froebel's Gifts. Project Gutenberg, 2010.

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