APA (7th ed.) Citation

Babbage, C. (2003). On the Economy of Machinery and Manufactures. Project Gutenberg.

Chicago Style (17th ed.) Citation

Babbage, Charles. On the Economy of Machinery and Manufactures. Project Gutenberg, 2003.

MLA (9th ed.) Citation

Babbage, Charles. On the Economy of Machinery and Manufactures. Project Gutenberg, 2003.

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