[publisher not identified], [date of publication not identified]
Buku Teks
Naewoe Press , 1977
Buku Teks
Paek, Nak-chong, 1938-
Changjak kwa Pipyongsa, 1998
Buku Teks
Foreign Languages, 1959
Buku Teks
Public Relations Association of Korea, 1974
Buku Teks