Yurzhenko, Alona, Olena Kononova, and Olena Diahyleva. “The Use of the Callan Method in Maritime English Teaching”. Educational Challenges 30, no. 2 (September 29, 2025): 126–140. Accessed June 7, 2026. https://www.educationalchallenges.org.ua/index.php/education_challenges/article/view/397.