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1. Winbow A.: The importance of effective communication International Seminar on Maritime English, Istanbul Technical University, Istanbul, Turkey, March 2002.
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2. An Interactive Test of Mariner Competence Report No: CG-D-04-97 September 1996.
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3. International Convention on Standards of Training, Certification and Watchkeeping for Seafarers, 1978 as amended in 1995. Seafarers’ Training, Certification and Watchkeeping (STCW) Code. International Maritime Organization. 24 July 1998.
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4. Ordinance of the Minister of Infrastructure dated 13th July 2005 on training programmes and assessment of competence in sphere of seamen’s qualifications (Dziennik Ustaw from year 2005, No. 173 , item 1445).