Bozeman, Barry, author
St. Martin's Press, 1979
Buku Teks
Parsons, Wayne, author
Kencana Prenada Media Group, 2011
Buku Teks
Stopher, Peter R.
Edward Elgar Publishing Limited, 2016
Buku Teks
Routledge, 2013
Buku Teks
Parsons, Wayne, author
Kencana, 2008
Buku Teks