Muhammad Hazrin bin Abd Ghapar. (2013). A study on soil chemical and physical properties of oxisols as indicator to predict shallow slope failure. Kulliyyah of Architecture and Environmental Design, International Islamic University Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Muhammad Hazrin bin Abd Ghapar. A Study on Soil Chemical and Physical Properties of Oxisols as Indicator to Predict Shallow Slope Failure. Kuala Lumpur: Kulliyyah of Architecture and Environmental Design, International Islamic University Malaysia, 2013.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Muhammad Hazrin bin Abd Ghapar. A Study on Soil Chemical and Physical Properties of Oxisols as Indicator to Predict Shallow Slope Failure. Kulliyyah of Architecture and Environmental Design, International Islamic University Malaysia, 2013.