Tiamson, Alfredo T
Davao City Ateneo De Davao 1970
Buku Referensi
Maier, Henry W
Harper and Row, 1978
Buku Teks
Winstedt, Richard O., author
Kegan Paul, Trench, Trubner & Co., 1943
Buku Referensi
Park, Ruth, author
Puffin Books, 1980
Koleksi Publik
Buku Teks