Amirah, A., T. . Suharto, E. . Yetti, A. . Sari, and R. . Mayridian. “The Influence of Covid-19 Preparedness Through Health Care Implementation on Ship Crew”. Media Kesehatan Masyarakat Indonesia, vol. 17, no. 4, Dec. 2021, pp. 116-23, doi:10.30597/mkmi.v17i4.13167.