Florence, P. Sargant, author
Routledge & Kegan Paul, 1957
Buku Teks
edited by Samuel M. Rosenblatt
Westview Press, 1979
Buku Teks
Dalen, Dirk van, author
Springer-Verlag, 1994
Buku Teks
Ferguson, John H., author
McGraw-Hill, 1961
Buku Teks
Woll, Peter, author
Longman , 2001
Buku Teks