Manalu, Eben E., Utama Abdi Tarigan, and Frank Bietra Buchari. 2018. “The Relationship Between Facial Injury Severity Scale (FISS) With Head and Cervical Injury at Adam Malik Medan Central General Hospital”. International Journal of Medical Science and Clinical Invention 5 (5):3810-15. https://doi.org/10.18535/ijmsci/v5i5.11.