von Ute Koithan, Helen Schmitz, Tanja Sieber, Ralf Sonntag
Klett Sprachen, 2017
Buku Teks SO
Choi, Nae-ok
(Ju) Chang jak gwa bi pyeong sa, 2001
Buku Teks
Menge, Herman
Berlin Langenscheidt 1961
Buku Referensi
by Peter Terrel [and others]
Harper Collins Publisher, 1991
Buku Referensi
Wahrmund, Adolf
J. Ricker'sche Verlags-Buchhandlung, 1898
Buku Referensi