APA (7th ed.) Citation

Cory, D. (2008). The Magic Soap Bubble. Project Gutenberg.

Chicago Style (17th ed.) Citation

Cory, David. The Magic Soap Bubble. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Cory, David. The Magic Soap Bubble. Project Gutenberg, 2008.

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