APA (7th ed.) Citation

Mills, J. (2009). Letters of a Radio-Engineer to His Son. Project Gutenberg.

Chicago Style (17th ed.) Citation

Mills, John. Letters of a Radio-Engineer to His Son. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Mills, John. Letters of a Radio-Engineer to His Son. Project Gutenberg, 2009.

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