APA (7th ed.) Citation

Baum, L. F. (2007). Sky Island. Project Gutenberg.

Chicago Style (17th ed.) Citation

Baum, L. Frank. Sky Island. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Baum, L. Frank. Sky Island. Project Gutenberg, 2007.

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