APA (7th ed.) Citation

Webster, B. (2004). Color Images from Mars Rovers Spirit and Opportunity. Project Gutenberg.

Chicago Style (17th ed.) Citation

Webster, Bob. Color Images from Mars Rovers Spirit and Opportunity. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Webster, Bob. Color Images from Mars Rovers Spirit and Opportunity. Project Gutenberg, 2004.

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