Carballo, B. M. (2001). I have never given up on this country - Ryan Cayabyab. Philippine Daily Inquirer.
Chicago-viite (17. p.)Carballo, Bibsy M. "I Have Never Given Up on This Country - Ryan Cayabyab." Philippine Daily Inquirer 2001.
MLA-viite (9. p.)Carballo, Bibsy M. "I Have Never Given Up on This Country - Ryan Cayabyab." Philippine Daily Inquirer, 2001.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.