Sinco, Vicente G.
University of Philippines , 1959
Buku Teks
Arcilla S.J, Jose S.
ADMU Press, 1998
Buku Teks
Sahlan Mohd. Saman, author
[Publisher not identified], [Date of publication not identified]
Buku Teks
Francisco, Juan R., author
Linguistic Society of The Philippines, 1973
Buku Teks
Dozier, Edward P.
Holt, Rinehart and Winston, 1967
Buku Teks