Harahap, Aqso Ampri. “Correlation of Ship Sanitation With Cockroach Density on Motor Vessel Docked in Port of Tanjung Perak Surabaya”. JURNAL KESEHATAN LINGKUNGAN 8, no. 2 (July 5, 2016): 172–183. Accessed April 28, 2025. https://e-journal.unair.ac.id/JKL/article/view/8011.