edited by David Ingram
Blackwell , 2002
Buku Teks
McClosky, Herbert, author
Macmillan, 1969
Buku Teks
Tansey, Stephen D., author
Routledge, 1996
Buku Teks
Combs, James E., author
Macmillan, 1984
Buku Teks
Eulau, Heinz, author
Bobbs-Merrill, 1963
Buku Teks