Woo, Joseph Yam Ting, author
Qesosa Education Publication, 2004
Buku Teks
Manuel, A. Arsenio
Manila: Filipiniana Publications, 1948
Buku Teks
Vendryes, J. (Joseph), 1875-1960, author
Routledge, 1996
Buku Teks
Sturtevant, Edgar H., author
Yale University Press, 1947
Buku Teks
Pike, Kenneth L. (Kenneth Lee), 1912-2000, author
University of Nebraska Press, 1982
Buku Teks