editor, Leandro A. Viloria
University of the Philippines, 1984
Buku Teks
UPM- UNESCO-UNEP International Environmental Education Programme , 1987
Buku Teks
Asian Development Bank, 1994
Buku Teks
Asian Development Bank, 1986
Buku Teks
Association of Southeast Asian Institutions of Higher Learning
University of Indonesia Press , 1980
Buku Teks