Freedman, Alan
Amacom, 1995
Buku Referensi
Greenfield, Jane
Oak Knoll Press, 1998
Buku Teks
Andersen, Dines
Copenhagen: Gyldendalske Boghandel, 1907
Buku Teks
American Psychiatric Press, 1984
Buku Referensi
Redden, Kenneth R.
The Michie Company, 1980
Buku Referensi