edited by Benjamin W. Allen
Better Homes and Gardens Books, 1997
Buku Teks SO
Keogh, James Edward
McGraw-Hill, 1977
Buku Teks SO
Sudjic, Deyan
Mitchell Beazley, 1986
Buku Referensi
Laughlin, Sara
American Library association, 2008
eBooks
edited by Cristina Paredes Beniftez
Page one, 2011
Buku Referensi