Kramer, Tom
ISEAS, 2007
Buku Teks
Rocamora, J. Eliseo
Philippine Center for Advanced Studies, 1975
Buku Teks
Brown, David, author
Routledge, 1994
Buku Teks
Brown, David, author
Routledge, 1996
Buku Teks
Cady, John F.
Harvard University Press, 1976
Buku Teks