Maree, Ahmed. “Comparison Between Two – Sided Power Distribution and Beta Distribution in Program Evaluation and Review Technique (PERT)”. TANMIYAT AL-RAFIDAIN 31, no. 94 (June 1, 2009): 284–299. Accessed December 4, 2025. https://tanmiyat.uomosul.edu.iq/index.php/tanmiyat/article/view/30110.