Bulmer-Thomas, Ivor
Phoenix House Ltd., 1953
Buku Teks
Cadle, Patrick R.
UNDP, 2008
Buku Teks
Konkrad-Adenauer-Stiftung, editor
Konkrad-Adenauer-Stiftung, 2007
Buku Teks
Ostrom, Vincent, author
University of Michigan Press, 1997
Buku Teks
Caprara, Gian Vittorio, author
Oxford University Press, 2016
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