Harris, Ralph
Institute of Economic Affairs, 1959
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Sutherland, Max, author
Allen and Unwin, 2000
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Ahmad Mulyana, author
1995
UI - Tesis (Membership)
Witri Suri, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2014
UI - Makalah dan Kertas Kerja
Rotzoll, Kim B.
GRID Publishing, 1976
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