Ingpen, Robert, author
Dragon`s World, 1994
Buku Referensi
Wharton, Edith, author
Random House, 1994
Buku Teks
Kostof, Spiro, author
Oxford University Press, 1995
Buku Teks
Kim, In-ok, author
Intiative, 2011
Buku Teks
Rand McNally and Company.
Rand Mcnally & Company, 2006
Buku Teks