Ika Andriani, Indriana Kristiawati, Soedarmanto S, Juli Prastyorini. The Effect of Staff Helpfulness and Communication on Customer Loyalty Through Passenger Satisfaction at PT. Dharma Lautan Utama, Perak Branch, Surabaya (KM. Dharma Kencana VII). JMS [Internet]. 2026 Aug. 10 [cited 2026 Oct. 11];6(03):1120-6. Available from: https://ejournal.seaninstitute.or.id/index.php/JMS/article/view/8992