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- https://phds.ucmerced.edu/sites/g/files/ufvvjh1401/f/webform/complete-guide-of-official-priceline-customer-service-contact-numbers-24-7-guide.pdf
- https://phds.ucmerced.edu/sites/g/files/ufvvjh1401/f/webform/complete-guide-of-official-booking-com-customer-service-contact-numbers-24-7-guide.pdf
- https://phds.ucmerced.edu/sites/g/files/ufvvjh1401/f/webform/complete-guide-of-official-delta-airlines-customer-service-contact-numbers-24-7-guide.pdf
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- https://phds.ucmerced.edu/sites/g/files/ufvvjh1401/f/webform/complete-list-of-american-airlines-official-customer-service-number-phone-number-guide.pdf
- https://phds.ucmerced.edu/sites/g/files/ufvvjh1401/f/webform/complete-tm-list-of-american-air-lines-customer-support-a-live-person-contact-number.pdf