Saputra, M. F., B. Setiawan, and S. Rini. “Logbook Quality Analysis at PT. Pertamina Patra Niaga Ships Using Sus and Webqual 4.0 Methods”. Jurnal Sosial Teknologi, vol. 6, no. 5, May 2026, pp. 1675-87, doi:10.59188/jurnalsostech.v6i5.32809.