APA (7th ed.) Citation

Low, D. A. (2012). An Introduction to Machine Drawing and Design. Project Gutenberg.

Chicago Style (17th ed.) Citation

Low, David Allan. An Introduction to Machine Drawing and Design. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Low, David Allan. An Introduction to Machine Drawing and Design. Project Gutenberg, 2012.

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