Widuri, S. et al. 2021. Sosialisasi Vaksin Covid-19 Kepada Tenaga Kesehatan Pelayanan Darah di UTD PMI Kota Surabaya Tahun 2020. Journal of Community Engagement in Health. 4, 2 (Sep. 2021), 511–517. DOI:https://doi.org/10.30994/jceh.v4i2.277.