O'Keeffe, J. (1800). The poor soldier: A comic opera, in two acts. As performed at the Theatre-Royal, Covent-Garden. By John O'Keeffe, Esq. printed by A. Strahan, Printers-Street; for T. N. Longman and O. Rees, Paternoster-Row.
Chicago Style (17th ed.) CitationO'Keeffe, John. The Poor Soldier: A Comic Opera, in Two Acts. As Performed at the Theatre-Royal, Covent-Garden. By John O'Keeffe, Esq. London: printed by A. Strahan, Printers-Street; for T. N. Longman and O. Rees, Paternoster-Row, 1800.
MLA (9th ed.) CitationO'Keeffe, John. The Poor Soldier: A Comic Opera, in Two Acts. As Performed at the Theatre-Royal, Covent-Garden. By John O'Keeffe, Esq. printed by A. Strahan, Printers-Street; for T. N. Longman and O. Rees, Paternoster-Row, 1800.
Warning: These citations may not always be 100% accurate.