Collins, Joe. 2007. « The Electronic Chart: 2nd Edition. Horst Hecht, Bernhard Berking, Gert Büttgenbach, Mathias Jonas, Lee Alexander, Published by GITC (currently: Reed Business Geo) in 2006 and Distributed by Reed Business Geo ». The International Hydrographic Review 8 (1). https://journals.lib.unb.ca/index.php/ihr/article/view/20786.