Rotor, N. S. (1980). Introduction to Philippine tourism. Integrated Research Center, De La Salle University.
Lua i Stíl Chicago (17ú heag.)Rotor, Nilda Servando. Introduction to Philippine Tourism. Manila: Integrated Research Center, De La Salle University, 1980.
Lua MLA (9ú heag.)Rotor, Nilda Servando. Introduction to Philippine Tourism. Integrated Research Center, De La Salle University, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.