APA (7th ed.) Citation

Shepp, J. W., & Shepp, D. B. (2008). Shepp's Photographs of the World. Project Gutenberg.

Chicago Style (17th ed.) Citation

Shepp, James W., and Daniel B. Shepp. Shepp's Photographs of the World. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Shepp, James W., and Daniel B. Shepp. Shepp's Photographs of the World. Project Gutenberg, 2008.

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