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.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিPhilippines Bureau of Tourism Services এবং Philippines. Rules and Regulations Governing the Business of Travel and Tour Agencies, Travel Representatives and Tour Guides. Manila: The Bureau, 1979.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিPhilippines Bureau of Tourism Services এবং Philippines. Rules and Regulations Governing the Business of Travel and Tour Agencies, Travel Representatives and Tour Guides. The Bureau, 1979.
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