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.
Chicago-referens (17:e uppl.)Philippines Department of Tourism Bureau of Special Services och Philippines. Rules and Regulations to Govern the Accreditation of Travel and Tour Services. [Manila]: Bureau of Special Services, Department of Tourism, 1992.
MLA-referens (9:e uppl.)Philippines Department of Tourism Bureau of Special Services och Philippines. Rules and Regulations to Govern the Accreditation of Travel and Tour Services. Bureau of Special Services, Department of Tourism, 1992.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.