Trawicky, Bernard, author
[American Library association, ], 2000
eBooks
Strassfeld, Michael, author
Harper and Row, 1985
Buku Referensi
Douglas, George William, author
H.W. Wilson, 1963
Buku Teks
E.P Dutton, 1987
Buku Teks
Fox, David J. Stuart
Jayakarta Agubg Offset, 1982.
Buku Teks