Philippines. Congress. House of Representatives. Congressional Planning and Budget Office. (1998). Regional profile, 1998-. Congressional Planning and Budget Office, House of Representatives.
Cita Chicago (17th ed.)Philippines. Congress. House of Representatives. Congressional Planning and Budget Office. Regional Profile, 1998-. Quezon City: Congressional Planning and Budget Office, House of Representatives, 1998.
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Atenció: Aquestes cites poden no estar 100% correctes.