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Buku Referensi
Lee, Hansol H.B.
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Buku Referensi
Shin, Hyong Sik, author
Lee Ki-Taek, 2010
Buku Teks
Routledge, 1996
Buku Teks
Lee, Hai-young, author
HollymCorp, 2006
Buku Teks