APA (7th ed.) Citation

(2011). Digital PDP15 Price List April, 1970. Project Gutenberg.

Chicago Style (17th ed.) Citation

Digital PDP15 Price List April, 1970. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Digital PDP15 Price List April, 1970. Project Gutenberg, 2011.

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