Sitorus, M. H., Suryanta, A., & Adi, S. (2019). THE ROLE OF MENTAL DEVELOPMENT OF INDONESIAN NAVY’S FIRST FLEET TO INCREASE THE OPERATION READINESS OF THE NAVY OFFICER. Jurnal Pertahanan Dan Bela Negara, 9(3), 89–101. https://doi.org/10.33172/jpbh.v9i3.646