Cita APA (7th ed.)

Siapno, F. E. (1998). Green brigade: A call to environmental action. Manila Bulletin.

Cita Chicago (17th ed.)

Siapno, Freriel E. "Green Brigade: A Call to Environmental Action." Manila Bulletin 1998.

Cita MLA (9th ed.)

Siapno, Freriel E. "Green Brigade: A Call to Environmental Action." Manila Bulletin, 1998.