APA (7th ed.) Citation

Hume, F. (2013). The Harlequin Opal, Vol. 3 (of 3) A Romance. Project Gutenberg.

Chicago Style (17th ed.) Citation

Hume, Fergus. The Harlequin Opal, Vol. 3 (of 3) A Romance. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Hume, Fergus. The Harlequin Opal, Vol. 3 (of 3) A Romance. Project Gutenberg, 2013.

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