Elzinga, Kenneth G., author
Yale University Press, 1976
Buku Teks
Gellhorn, Ernest, author
West , 1994
Buku Teks
Gellhorn, Ernest, author
St.paul Minn, 1986
Buku Teks
Gellhorn, Ernest, author
West, 2004
Buku Teks
edited by Sylvester E. Berki
Health, 1966
Buku Teks