APA (7th ed.) Citation

Burroughs, E. R. (1993). Tarzan and the Jewels of Opar. Project Gutenberg.

Chicago Style (17th ed.) Citation

Burroughs, Edgar Rice. Tarzan and the Jewels of Opar. Project Gutenberg, 1993.

MLA (9th ed.) Citation

Burroughs, Edgar Rice. Tarzan and the Jewels of Opar. Project Gutenberg, 1993.

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