Freedman, Ronald, author
Irvington, 1975
Buku Teks
Kemp, Herman C., author
KITLV Press, 1990
Buku Referensi
Alexander-Frutschi, author
Stanford Research Institute, 1963
Buku Teks
Groenendael, Victoria M. Clara van, author
Foris Publications, 1987
Buku Referensi
Clamp, Cynthia G. L., author
Sage, 1999
Buku Teks