Summer Institute of Linguistics, 1960
Buku Teks
Mercado, Leonardo N.
Divine Word University, 1976
Buku Teks
Lopez, Violeta B.
University of the Philippines Press, 1976
Buku Teks
Jose Rizal, author
Pustaka Jaya, 1994
Buku Teks
Dozier, Edward P.
Holt, Rinehart and Winston, 1967
Buku Teks