Jordan, R. R.
Longman, 2001
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Oshima, Alice
Longman, 1997
Buku Teks
editors, Junaidi, Elda N. Auliansani, Farah S. Azizah, M. Umar Sadikin
UI Publishing, 2020
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Marti Fauziah Ariastuti
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2011
UI - Tesis Open
edited by Robert Finch and John Elder
W.W. Norton, 2002
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