Hannay, Annie M.
U.S. Government Printing Office, 1953
Buku Teks
Korea Foundation, [date of publication not identified]
Buku Referensi
Olive III, J Fred
Educational Technology Publications, 1995
Buku Referensi
Francis, Simon
University of Hull, Centre for South-East Asian Studies, 1993
Buku Referensi
Berger, Curtis J., author
Little, Brown, 1975
Buku Teks