Polski Rejestr Statków. (2006). Principles for examination of welders. Polski Rejestr Statków.
Citazione stile Chigago Style (17a edizione)Polski Rejestr Statków. Principles for Examination of Welders. Gdańsk: Polski Rejestr Statków, 2006.
Citatione MLA (9a ed.)Polski Rejestr Statków. Principles for Examination of Welders. Polski Rejestr Statków, 2006.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.