Suliman, N., و N. Al-Zubaidi. Improve Rheological Properties of Palygorskite Water-Based Drilling Fluid by Caustic Soda and Soda Ash. مجلة الهندسة, م 26, عدد 6, June 2020, ص 1-17, doi:10.31026/j.eng.2020.06.01.