Conrad, Joseph, 1857-1924
Cambridge University Press, 2012
Buku Teks SO
Ecco, 1992
Buku Teks SO
Diantri Seprina Putri
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2019
UI - Tesis Membership
White, David Manning
Macmillan, 1983
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Richetti, John
John Wiley & Sons, 2017
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