APA (7th ed.) Citation

Castlemon, H. (2013). Frank in the Mountains. Project Gutenberg.

Chicago Style (17th ed.) Citation

Castlemon, Harry. Frank in the Mountains. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Castlemon, Harry. Frank in the Mountains. Project Gutenberg, 2013.

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