Rahmadhani Fitri, Hendra Fahruddin Siregar, Adi Sastra Pengalaman Tarigan. Implementation Of Health Protocol In Preventing The Spread Of The Covid 19 Virus. IJCS [Internet]. 2021 Aug. 12 [cited 2024 Apr. 29];1(2):153-7. Available from: http://ijcsnet.id/index.php/go/article/view/26