APA (7th ed.) Citation

Ostrander, I., & Stahr, P. (2009). Anything Once. Project Gutenberg.

Chicago Style (17th ed.) Citation

Ostrander, Isabel, and Paul Stahr. Anything Once. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Ostrander, Isabel, and Paul Stahr. Anything Once. Project Gutenberg, 2009.

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