Kim, Chin-suk
Humanitasu , 2007
Buku Teks
Swindells, Julia, author
Polity Press, 1985
Buku Teks
Hawkins, Everett D.
Yale University, 1961
Buku Teks
Mackenzie, Gavin.
Cambridge University Pres, 1973
Buku Teks
Patterson, Samuel Howard, author
McGraw-Hill, 1929/1943
Buku Teks