Ball, John
Oughtershaw Press, 1996
Buku Teks
Heere, Wybo P., author
Oceana, 1972
Buku Teks
White, Irvin L., author
University of Arizona Press, 1972
Buku Teks
Martin Bartels ...[et al.]
Metzner, 1981
Buku Teks
Kemp, Herman C., author
KITLV Press, 1990
Buku Referensi