APA (7th ed.) Citation

Walter, R. (1996). The Secret Guide to Computers. Project Gutenberg.

Chicago Style (17th ed.) Citation

Walter, Russ. The Secret Guide to Computers. Project Gutenberg, 1996.

MLA (9th ed.) Citation

Walter, Russ. The Secret Guide to Computers. Project Gutenberg, 1996.

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