APA (7th ed.) Citation

Milne, A. A. (2004). The Sunny Side. Project Gutenberg.

Chicago Style (17th ed.) Citation

Milne, A. A. The Sunny Side. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Milne, A. A. The Sunny Side. Project Gutenberg, 2004.

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