Olsen, Gary, author
Ohio North Light Books , 1997
Buku Teks
edited by Camara, Antonio S.; Praper, Jonathan(ed.) (change)
Routledge, 1999
Buku Teks
Dunckel, Jacqueline, author
Self-Counsel, 1984
Koleksi Publik
Rafe, Stephen C.
Harper Business, 1990
Buku Teks
Glencoe, 2003
Buku Teks