Schwab, Donald P, author
New jersey, 2005
Buku Teks
Mohrman, Susan Albers, author
Berrett-Koehler, 2011
Buku Teks
Brennen, Bonnie, author
Routledge, 2017
Buku Teks
Kennet Lynggaard, Ian Manners, karl Lofgren, editor
Palgrave Macmillan, 2015
Buku Teks
Hesseling, P.G.M.
Pergamon Press, 1982
Buku Teks