Villanueva, J. (2002). A position paper against House Bill No. 4110. IN Educators speak [column]. Manila Bulletin.
Chicago-viite (17. p.)Villanueva, Jose. "A Position Paper Against House Bill No. 4110. IN Educators Speak [column]." Manila Bulletin 2002.
MLA-viite (9. p.)Villanueva, Jose. "A Position Paper Against House Bill No. 4110. IN Educators Speak [column]." Manila Bulletin, 2002.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.