Ople, B. F. (1997). Why the attempt to change the charter is doomed. IN Horizons [column]. Manila Bulletin.
Chicago-referens (17:e uppl.)Ople, Blas F. "Why the Attempt to Change the Charter Is Doomed. IN Horizons [column]." Manila Bulletin 1997.
MLA-referens (9:e uppl.)Ople, Blas F. "Why the Attempt to Change the Charter Is Doomed. IN Horizons [column]." Manila Bulletin, 1997.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.