APA (7th ed.) Citation

Penrose, M. (2009). The Campfire Girls of Roselawn; Or, a Strange Message from the Air. Project Gutenberg.

Chicago Style (17th ed.) Citation

Penrose, Margaret. The Campfire Girls of Roselawn; Or, a Strange Message from the Air. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Penrose, Margaret. The Campfire Girls of Roselawn; Or, a Strange Message from the Air. Project Gutenberg, 2009.

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