Ibrahim, J., I. Salman, و T. Chyad. Wastewater Bio-Solids Management for Fertilizer Quality Using Co- Composting Process. مجلة الهندسة, م 21, عدد 1, Jan. 2015, ص 29-44, http://joe.uobaghdad.edu.iq/index.php/main/article/view/474.