National Seminar-Workshop in Education for International Understanding (3rd : 1968 : Iloilo City), Abella, P. F., Buan, P. A., & Senora, L. R. (1970). Education for international understanding: An evaluation. UNESCO National Commission of the Philippines.
Chicago-referens (17:e uppl.)National Seminar-Workshop in Education for International Understanding (3rd : 1968 : Iloilo City), Pedro F. Abella, Petronilo A. Buan, och Ludivina R. Senora. Education for International Understanding: An Evaluation. Manila: UNESCO National Commission of the Philippines, 1970.
MLA-referens (9:e uppl.)National Seminar-Workshop in Education for International Understanding (3rd : 1968 : Iloilo City), et al. Education for International Understanding: An Evaluation. UNESCO National Commission of the Philippines, 1970.