Markos, Ni
Institute of Linguistics Philippine, 1966
Buku Teks
Medhurst, Walter Henry
Crocker & Brewster, 1838
Buku Teks
Noll, Kenneth
Ann Anbor Science, 1975
Buku Teks
Graves, Jonathan
Longman, 1996
Buku Teks
Duncan, J. michael, author
John Wiley & Sons, 2005
Buku Teks