Rotor, N. S. (1980). Introduction to Philippine tourism. Integrated Research Center, De La Salle University.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRotor, Nilda Servando. Introduction to Philippine Tourism. Manila: Integrated Research Center, De La Salle University, 1980.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRotor, Nilda Servando. Introduction to Philippine Tourism. Integrated Research Center, De La Salle University, 1980.
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