APA (7th ed.) Citation

O'Brien, H. (2013). The Round Towers of Ireland or, The History of the Tuath-De-Danaans. Project Gutenberg.

Chicago Style (17th ed.) Citation

O'Brien, Henry. The Round Towers of Ireland or, The History of the Tuath-De-Danaans. Project Gutenberg, 2013.

MLA (9th ed.) Citation

O'Brien, Henry. The Round Towers of Ireland or, The History of the Tuath-De-Danaans. Project Gutenberg, 2013.

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