Lumban Batu, Purnama Nancy, Antoni Arif Priadi, and Wida Cahyaningrum. “Accessible Learning Sources: A Need Analysis on Maritime English Learning Apps”. Transactions on Maritime Science 10, no. 2 (October 21, 2021): 520–525. Accessed April 23, 2024. https://www.toms.com.hr/index.php/toms/article/view/414.