APA (7th ed.) Citation

Cromwell, J. H. (2012). A System of Easy Lettering. Project Gutenberg.

Chicago Style (17th ed.) Citation

Cromwell, John Howard. A System of Easy Lettering. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Cromwell, John Howard. A System of Easy Lettering. Project Gutenberg, 2012.

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