Whitehead, Randal
Rockport Publishers, 1999
Buku Referensi
Sudjic, Deyan
Mitchell Beazley, 1986
Buku Referensi
Johnson, Glen M.
McGraw-Hill, 1999
Buku Teks
Johnson, Glenn M.
McGraw-Hill, 1999
Buku Referensi
Eckbo, Garrett
McGraw-Hill, 1978.
Buku Teks