Mönnigmann, Bernd, and Adelija Čulić-Viskota. “Standardised English Language Proficiency Testing for Seafarers”. Transactions on Maritime Science 6, no. 2 (October 21, 2017): 147–154. Accessed March 29, 2024. https://www.toms.com.hr/index.php/toms/article/view/184.