Gaston Leroux. (2019). "Phantom of the Opera (Young Reading Level 2) [Paperback] [Jan 01, 2010] Gaston LeRoux". FQ Books.
Chicago-viite (17. p.)Gaston Leroux. "Phantom of the Opera (Young Reading Level 2) [Paperback] [Jan 01, 2010] Gaston LeRoux". FQ Books, 2019.
MLA-viite (9. p.)Gaston Leroux. "Phantom of the Opera (Young Reading Level 2) [Paperback] [Jan 01, 2010] Gaston LeRoux". FQ Books, 2019.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.