APA (7th ed.) Citation

O'Keeffe, J., & Inchbald, M. (2011). The Castle of Andalusia A Comic Opera, in Three Acts. Project Gutenberg.

Chicago Style (17th ed.) Citation

O'Keeffe, John, and Mrs Inchbald. The Castle of Andalusia A Comic Opera, in Three Acts. Project Gutenberg, 2011.

MLA (9th ed.) Citation

O'Keeffe, John, and Mrs Inchbald. The Castle of Andalusia A Comic Opera, in Three Acts. Project Gutenberg, 2011.

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