Philippines Bureau of Tourism Services & Philippines. (1979). Rules and regulations governing the business of travel and tour agencies, travel representatives and tour guides. The Bureau.
Chicago-referens (17:e uppl.)Philippines Bureau of Tourism Services och Philippines. Rules and Regulations Governing the Business of Travel and Tour Agencies, Travel Representatives and Tour Guides. Manila: The Bureau, 1979.
MLA-referens (9:e uppl.)Philippines Bureau of Tourism Services och Philippines. Rules and Regulations Governing the Business of Travel and Tour Agencies, Travel Representatives and Tour Guides. The Bureau, 1979.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.