Richards, Kristen
Rockport Publishers, 2002
Buku Teks
Tschumi, Bernard, 1944-, author
St. Martin`s Press, 1981
Buku Teks
Molnar, Felicia Eisenberg, author
Rockport, 2001
Buku Teks
Brown, Ivor
Gerald Duckworth & Co. LTD, 1950
Buku Teks
Indyk, Ivor
Oxford University Press, 1993
Buku Teks