APA (7th ed.) Citation

Ferguson, R. (2011). Surnames as a Science. Project Gutenberg.

Chicago Style (17th ed.) Citation

Ferguson, Robert. Surnames as a Science. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Ferguson, Robert. Surnames as a Science. Project Gutenberg, 2011.

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