Cita APA (7th ed.)

Ople, B. F. (2002). The invisible army. IN Horizons [column]: Strategic concepts. Manila Bulletin.

Cita Chicago (17th ed.)

Ople, Blas F. "The Invisible Army. IN Horizons [column]: Strategic Concepts." Manila Bulletin 2002.

Cita MLA (9th ed.)

Ople, Blas F. "The Invisible Army. IN Horizons [column]: Strategic Concepts." Manila Bulletin, 2002.