Kunjungi situs berikut :
http://www.wawasandigital.com/index.php?option=com_content&task=view&id=38371&Itemid=32
http://www.blogger.com/post-create.g?blogID=4419050778411910344
http://suaramerdeka.com/v1/index.php/read/cetak/2010/03/11/101900/Model-Geogrit-Diuji-Coba-sebagai-Pengganti-Aspal-
