Kemp, Herman C.
KITLV Press, 1990
Buku Referensi
Groenendael, Victoria M. Clara van
Foris Publications, 1987
Buku Referensi
Freedman, Ronald
Irvington, 1975
Buku Teks
Clamp, Cynthia G. L.
Sage, 1999
Buku Teks
Bridson, Gavin D.R.
Gerland Publishing, Inc., 1994
Buku Teks