1. International Maritime Organization (IMO), International Shipping Facts and Figures. Information Resources on Trade, Safety, Security, Environment. Maritime Knowledge Centre, 〈http://www.imo.org/KnowledgeCentre/ShipsAndShippingFactsAndFigures/TheRoleandImportanceofInternationalShipping/Documents/International%20Shipping%20-%20Facts%20and%20Figures.pdf〉.
2. Helsinki Commission HELCOM, Maritime Activities in the Baltic Sea, An integrated thematic assessment on maritime activities and response to pollution at sea in the Baltic Sea Region, Baltic Sea Environmental Proceedings, 2010, p. 123. 〈http://www.helcom.fi/Lists/Publications/BSEP123.pdf〉
3. Autero V. Uusi Trafi, Turvallisuustiedon analyysi ja turvallisuuden hallinta, 2012. 〈http://www.trafi.fi/filebank/a/1326702723/c616200230cad5c2627096fbe3920c74/8932-Turvallisuustiedon_analyysi_ja_tiedon_hallinta_-_Autero.pdf〉.
4. Finnish Transport Safety Agency, Trafi, Finnish Annual Maritime Safety Review, 2013. 〈http://www.trafi.fi/filebank/a/1387539363/14329d965fb6d445c61b1e1c19c10e84/13884-Trafi_Merenkulun_turvallisuuskatsaus_2013_eng.pdf〉.
5. Analysis of the marine traffic safety in the Gulf of Finland;Kujala;Reliab. Eng. Syst. Saf.,2009