City Visions
Longman, 2000
Buku Teks
Hughes, Robert
American Visions
Alfred A. Knopf, 1997
Buku Teks
Richards, Jeffrey
Visions of yesterday
Routledge and Kegan Paul, 1973
Buku Teks SO
Hubbard, L. Ron, 1911-1986
L. Ron Hubbard : a profile
Bridge Publications, Inc., 2012
Buku Referensi
Mok, Jeong Soo.
Hangugeo munbeob-ron
Worin, 2003
Buku Teks