– http://www.aapadirectory.com
– http://www.bollingershipyards.com
– http://www.cargosystems.net
– http://www.containershipping.com
– http://www.coopertsmith.com
– http://www.dot.gov
– http://www.informare.it
– http://www.lloydslist.com
– http://www.manufacturing.net
– http://www.marad.dot.gov
– http://www.shippingdigest.com