Fortuna, J. (1994). Abu Sayyaf a full-blown problem. IN East and West [column]. Manila Chronicle.
Chicago-viite (17. p.)Fortuna, Julius. "Abu Sayyaf a Full-blown Problem. IN East and West [column]." Manila Chronicle 1994.
MLA-viite (9. p.)Fortuna, Julius. "Abu Sayyaf a Full-blown Problem. IN East and West [column]." Manila Chronicle, 1994.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.