Duha Zeki Al-Swefee, Malath I. Yousif, Fatimah Sahib Abed, and Athraa Abdulamir Abdulrab. “WASTEWATER TREATMENTS: A REVIEW”. World Bulletin of Public Health, vol. 12, July 2022, pp. 97-104, https://scholarexpress.net/index.php/wbph/article/view/1161.