APA (7th ed.) Citation

Scoville, S., & Bull, C. L. (2013). The Inca Emerald. Project Gutenberg.

Chicago Style (17th ed.) Citation

Scoville, Samuel, and Charles Livingston Bull. The Inca Emerald. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Scoville, Samuel, and Charles Livingston Bull. The Inca Emerald. Project Gutenberg, 2013.

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