Παραπομπή σε μορφή APA (7η εκδ.)

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.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Alfonso, Oscar Emel S., Carmela Helene S. Rieza, και Ramon Benedicto A. Alampay. The Product Life Cycle Theory and Tourism in the Philippines: Case Studies of Pagsanjan and Baguio City.

Παραπομπή σε μορφή MLA (9th εκδ.)

Alfonso, Oscar Emel S., et al. The Product Life Cycle Theory and Tourism in the Philippines: Case Studies of Pagsanjan and Baguio City.