Rottenberg, Annette T.
St. Martin, 1988
Buku Teks
Crusius, Timothy W., author
McGraw-Hill, 2002
Buku Teks
Caper, Robert, author
Routledge, Taylor & Francis Group, 2009
Buku Teks
Podmore, Valerie N. , author
McGraw-Hill, 2012
Buku Teks
Bodgan, Robert, author
Usaha Nasional, 1993
Buku Teks