Andersen, Dines
Copenhagen: Gyldendalske Boghandel, 1907
Buku Teks
American Psychiatric Press, 1984
Buku Referensi
Stachowitsch, Michael
Wiley-Liss, 1992
Buku Teks
New York Institute of Finance, 1988
Buku Teks
Abrams, M. H. (Meyer Howard), 1912-
Harcourt Brace Jovanovich College Publishers, 1971
Buku Teks