Andrea Malaya M. Ragragio, author
Nakanishi Printing Company, 2019
Artikel Jurnal
Elkins, Richard E., author
University of Hawaii Press, 1968
Buku Referensi
Philippines: The Summer Institute of Linguistics, 1954
Buku Teks
Elkins, Richard E., author
North-Holland, 1971
Buku Teks
Daniel, Hawthorne, author
G.P. Putnam's Sons , 1943
Buku Teks