edited by Angel Aparicio
University of Santo Tomas, 2001
Buku Referensi
editor, Angel Aparicio
University of Santo Tomas, 2006
Buku Referensi
editor, Angel Aparicio
University of Santo Tomas, 2005
Buku Referensi
Thorpe, 1994
Buku Referensi
Encyclopaedia Britannica Inc., 2002
Buku Referensi