Koehler, Robert, 1975-
Seoul Selection, 2009
Buku Referensi
written by Koean Cultural and Historical Survey Society ; translated by Jung Ha Yun
Korean, Dolbegae Publishers, 2007
Buku Referensi
Koehler, Robert
Seoul Selection, 2009
Buku Teks SO
Shurter, Robert L.
McGraw-Hill, 1957
Buku Teks
Buku Teks