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Routledge, [date of publication not identified]
Buku Teks
Dwyer, Susan
Wodsworth Publishing Company, 1995
Buku Teks
Akbar Nugroho Putro, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2013
UI - Makalah dan Kertas Kerja
edited by Catherine Itzin
Oxford University Press, 1992
Buku Teks
Universitas Indonesia, 2011
UI - Skripsi (Open)