Davis, Kenneth C.
Perennial, 2004
Buku Teks
Buck, Pearl Sydenstricker, 1892-1973
A. Signet Book, 1971
Buku Teks
Hazairin
Tintamas, 1969
Buku Teks
Macarthur, John Robertson
D. Appleton-Century, 1936
Buku Teks
Markos, Ni
Institute of Linguistics Philippine, 1966
Buku Teks