Goodrich, Chauncey A., author
Bobbs-Merrill, 1963
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The Presidential Secretariat , 1992
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edited by Emma Beare, contributing Cathy Lowne
Bounty Books, 2013
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Endah Sylvia, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2016
UI - Makalah dan Kertas Kerja
Dowis, Richard, author
[American Management Association, ], 2000
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