Hazen, Charles Downer
Buku Teks SO
edited by T.C.W. Blanning
Oxford University Press, 1996
Buku Teks SO
Lindemann, Albert S.
John Wiley & Sons, 2013
Buku Teks SO
Sunoo, Harold Hakwon
Korean-American Cultural Foundation,, 1970
Buku Teks SO
Palmer, Robert Roswell, 1909-2002
Princeton University Press, 1964
Buku Teks SO