APA (7th ed.) Citation

Penrose, M. (2011). The Motor Girls at Camp Surprise; Or, The Cave in the Mountains. Project Gutenberg.

Chicago Style (17th ed.) Citation

Penrose, Margaret. The Motor Girls at Camp Surprise; Or, The Cave in the Mountains. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Penrose, Margaret. The Motor Girls at Camp Surprise; Or, The Cave in the Mountains. Project Gutenberg, 2011.

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