APA (7th ed.) Citation

Cambridge, A., & Simmons, S. C. (2011). A Humble Enterprise. Project Gutenberg.

Chicago Style (17th ed.) Citation

Cambridge, Ada, and St. Clair Simmons. A Humble Enterprise. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Cambridge, Ada, and St. Clair Simmons. A Humble Enterprise. Project Gutenberg, 2011.

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