edited by R.P. Draper
Macmillan, 1986
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Everyman's Library, 1991
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Cahyawati
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 1991
UI - Skripsi Membership
Thomas, George B.
Pearson - Addison Wesley, 2008
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George Thomas,jr, MauriceD Weir, Joel Hass, Christhopher Heil
Penerbit Erlangga, 2017
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