(1999). Ibon facts and figures 1999. Ibon Foundation Databank and Research Center.
Cita Chicago (17th ed.)Ibon Facts and Figures 1999. Manila: Ibon Foundation Databank and Research Center, 1999.
Cita MLA (9th ed.)Ibon Facts and Figures 1999. Ibon Foundation Databank and Research Center, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.