English, Anthony, author
Department of Environment and Conservation, 2005
Buku Teks
Maeyta Selli, author
Management Research Center (MRC) Department of Management, Faculty of Economics, University of Indonesia and Philip Kotler Center, 2014
Artikel Jurnal
Ahearn, Laura M. author
John Wiley & Sons, Incorporated,, 2016
Buku Teks
Winfield,Louise
Publik Affairs Press, 1971
Buku Teks
Lechner, Frank J., author
Blackwell, 2005
Buku Teks