APA (7th ed.) Citation

Optic, O. (2008). A Spelling-Book for Advanced Classes. Project Gutenberg.

Chicago Style (17th ed.) Citation

Optic, Oliver. A Spelling-Book for Advanced Classes. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Optic, Oliver. A Spelling-Book for Advanced Classes. Project Gutenberg, 2008.

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