Joy Jaya Mardika, J. J. M.; octa, lidya; muhtadi, adhi. Pengaruh Operasional Vessel Traffic Services (VTS) Terhadap Keselamatan Di Alur Pelayaran Barat Surabaya: The Influence of Vessel Traffic Services (VTS) Operations on Safety in the West Surabaya Shipping Route. CONCRETE 2023, 1, 133-140.