Asres, Muluken, and Fasil Tessema. “Contribution of Plastic Bags to the Retention of Child Immunization Cards in Gambella Region and Assosa Zone, Benishangul-Gumuz Region, Ethiopia”. The Ethiopian Journal of Health Development 33, no. SPECIAL IS (July 21, 2019). Accessed May 23, 2022. https://ejhd.org/index.php/ejhd/article/view/2425.