APA (7th ed.) Citation

Randolph, H., Fairfax, V., & Ripley, H. A. (2013). The Secret of Casa Grande Mexican Mystery Stories #1. Project Gutenberg.

Chicago Style (17th ed.) Citation

Randolph, Helen, Virginia Fairfax, and Helen A. Ripley. The Secret of Casa Grande Mexican Mystery Stories #1. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Randolph, Helen, et al. The Secret of Casa Grande Mexican Mystery Stories #1. Project Gutenberg, 2013.

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