L. Simorangkir, Ice Septriani Saragih, Mardiati Barus, and David Sumanto Napitupulu, “SURVEI PERILAKU PENCEGAHAN COVID-19 PADA IBU MAHASISWA NERS STIKes SANTA ELISABETH MEDAN”, JIKI, vol. 7, no. 2, pp. 110-115, Sep. 2021.