Dicenso, James J., author
Routledge, 1999
Buku Teks
Gottfried Heuer, editor
Routledge, 2011
Buku Teks
Eagle, Morris N.
McGraw-Hill, 1984
Buku Teks
Pile, Steve, author
Routledge, 1996
Buku Teks
Caper, Robert, author
Routledge, Taylor & Francis Group, 2009
Buku Teks