Kenneth A. Adams, author
United States of America, 2008
Buku Teks
Crystal, David, 1941-, author
Longman, 1993
Buku Teks
Parissien, Steven
Phaidon, 1994
Buku Teks
Griffiths, Sally, author
St. Martins Press, 2002
Buku Teks
Campbell, William Giles, author
Houghton Mifflin, 1967
Buku Teks