Bunbongkarn, Suchit
Institute of southeast Asian studies, 1996
Buku Teks
editors, Marlon A. Wui, MA. Glenda S. Lopez
Third World Studies Center, 1997
Buku Teks
Laquian, Aprodicio A.
University of Philippines, 1966
Buku Teks
Artikel Jurnal
Cobban, Alfred
Collins Clear-Type Press, 1969
Buku Teks