Phi chon-deug
Jigyeongsa, 2007
Buku Teks
Lee Gyeong Ja, Yu Shi Chun, Kang Seok Kyeong
Changbi, 2008
Buku Teks
Chang bi, 2006
Buku Teks
Robert Maynard Hutchins, editor in chief
Encyclopaedia Britannica, Inc., 1952
Buku Referensi
Pickard, J. D., editor
Springer, 2012
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