British Library, 1994
Buku Referensi
Thompson, James, author
Clive Bingley , 1982
Buku Teks
American Library Association, 2018
Majalah, Jurnal, Buletin
Design Media Publishing Limited, 2010
Buku Referensi
Hammer, Bjarne, author
Roads, 2014
Buku Referensi