Ocampo, A. R. (1999). Pre-Spanish Filipinos knew how to write. Philippine Daily Inquirer.
Chicago-viite (17. p.)Ocampo, Ambeth R. "Pre-Spanish Filipinos Knew How to Write." Philippine Daily Inquirer 1999.
MLA-viite (9. p.)Ocampo, Ambeth R. "Pre-Spanish Filipinos Knew How to Write." Philippine Daily Inquirer, 1999.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.