Ecumenical Center for Development. (1982). Philippine regional profiles. Ecumenical Center for Development.
Cita Chicago (17th ed.)Ecumenical Center for Development. Philippine Regional Profiles. Quezon City: Ecumenical Center for Development, 1982.
Cita MLA (9th ed.)Ecumenical Center for Development. Philippine Regional Profiles. Ecumenical Center for Development, 1982.
Atenció: Aquestes cites poden no estar 100% correctes.