Al-Ibrahim, K. I., & Elaine V. Wolfe. (1984). An investigation of differences among elementary social studies teachers in Riyadh, Saudi Arabia, in their use of, attitudes toward, and perception of their ability to use the problem solving method. University of Northern Colorado.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Al-Ibrahim, Khaled I., و Elaine V. Wolfe. An Investigation of Differences Among Elementary Social Studies Teachers in Riyadh, Saudi Arabia, in Their Use of, Attitudes Toward, and Perception of Their Ability to Use the Problem Solving Method. Colorado: University of Northern Colorado, 1984.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Al-Ibrahim, Khaled I., و Elaine V. Wolfe. An Investigation of Differences Among Elementary Social Studies Teachers in Riyadh, Saudi Arabia, in Their Use of, Attitudes Toward, and Perception of Their Ability to Use the Problem Solving Method. University of Northern Colorado, 1984.