Ople, B. F. (1997). Mindanao. IN Horizons [column]: FVR's last card? Manila Bulletin.
芝加哥风格引文Ople, Blas F. "Mindanao. IN Horizons [column]: FVR's Last Card?" Manila Bulletin 1997.
MLA引文Ople, Blas F. "Mindanao. IN Horizons [column]: FVR's Last Card?" Manila Bulletin, 1997.
警告：这些引文格式不一定是100％准确.