Keum, Jang-tae
Jimoondang, 2000
Buku Teks
Amery, L.S.
Oxford University Press, 1953
Buku Teks
Pringle, John Martin Douglas, 1912-
Angus and Robertson, 1971
Buku Teks
Matsushita, Konosuke
PHP Institute International, 1982
Buku Teks
Mukhina, Vera
Foreign Languages Publishing House, [Date of publication not identified]
Buku Teks