Philippines Department of Tourism Bureau of Special Services & Philippines. (1992). Rules and regulations to govern the accreditation of travel and tour services. Bureau of Special Services, Department of Tourism.
Cita Chicago (17th ed.)Philippines Department of Tourism Bureau of Special Services i Philippines. Rules and Regulations to Govern the Accreditation of Travel and Tour Services. [Manila]: Bureau of Special Services, Department of Tourism, 1992.
Cita MLA (9th ed.)Philippines Department of Tourism Bureau of Special Services i Philippines. Rules and Regulations to Govern the Accreditation of Travel and Tour Services. Bureau of Special Services, Department of Tourism, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.