Philippines. National Statistics Office. (1999). National demographic survey, 1998. National Statistics Office.
Cita Chicago (17th ed.)Philippines. National Statistics Office. National Demographic Survey, 1998. Manila: National Statistics Office, 1999.
Cita MLA (9th ed.)Philippines. National Statistics Office. National Demographic Survey, 1998. National Statistics Office, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.