APA (7th ed.) Citation

Wiggin, K. D. S. (2005). Polly Oliver's Problem. Project Gutenberg.

Chicago Style (17th ed.) Citation

Wiggin, Kate Douglas Smith. Polly Oliver's Problem. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Wiggin, Kate Douglas Smith. Polly Oliver's Problem. Project Gutenberg, 2005.

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