Woll, Peter
Little, Brown, 1984
Buku Teks
Woll, Peter
Little, Brown, 1965
Buku Teks
Robert E. Diclerico, Allan S. Hammock, editor
McGraw-Hill, 2009
Buku Teks
Levine, Herbert M.
Wardsworth, 2004
Buku Teks
OConnor, Karen
Addison Wesley Longman, 2001
Buku Teks