Alfonso, O. E. S., Rieza, C. H. S., & Alampay, R. B. A. The product life cycle theory and tourism in the Philippines: Case studies of Pagsanjan and Baguio City.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAlfonso, Oscar Emel S., Carmela Helene S. Rieza, और Ramon Benedicto A. Alampay. The Product Life Cycle Theory and Tourism in the Philippines: Case Studies of Pagsanjan and Baguio City.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAlfonso, Oscar Emel S., et al. The Product Life Cycle Theory and Tourism in the Philippines: Case Studies of Pagsanjan and Baguio City.
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