Thorpe, 1994
Buku Referensi
Association for Asian Studies, Inc., 1981
Buku Referensi
Troxel, Ronald L., author
Wiley-Blackwell, 2012
Buku Teks
Currency Press, 1984
Buku Teks
edited by Angel Aparicio and Estrella S. Majuelo
University of Santo Tomas, 2015
Buku Referensi