Archiwum Państwowe w Szczecinie (State Archives in Szczecin), Rep. 126, Krajowy Urząd Skarbowy w Szczecinie ↑ Statistical yearbook of maritime economy — Warsaw, Szczecin: Central Statistical Office - Statistical Office in Szczecin, 2007. — P. 65, 86. ↑ Ships entering ports in Szczecin and Swinoujscie 2006-2007.