Buchanan, James M.
Liberty Fund, Inc., 2000
Buku Referensi
Hunik Sri Runing Sawitri
Faculty of Economics and Business Universitas Sebelas Maret,, 2016
Artikel Jurnal
Nika Pranata
Indonesian Institute of Sciences (LIPI), 2015
Artikel Jurnal
Boulding, Kenneth Ewart, 1910-1993
Harper & Row, 1966
Buku Teks
Robinson, Joan
C.A. Watts, 1962
Buku Teks