Kemp, Herman C., author
KITLV Press, 1990
Buku Referensi
Groenendael, Victoria M. Clara van, author
Foris Publications, 1987
Buku Referensi
Freedman, Ronald, author
Irvington, 1975
Buku Teks
Clamp, Cynthia G. L., author
Sage, 1999
Buku Teks
Dobby, E.H.G. (Ernest Henry George), 1906-1981, author
University of London Press, 1950
Buku Teks