Andersen, Dines
Copenhagen: Gyldendalske Boghandel, 1907
Buku Teks
American Psychiatric Press, 1984
Buku Referensi
Pfeiffer, J. William, author
University Associates, 1985
Buku Teks
Library Association Publishing, 1994
Buku Referensi
Library Association, 1982
Buku Referensi