Ong, P. Y. (1987). The effects of positive reinforcement and punishment on upper primary pupil's disruptive behaviour and their perceptions of the classroom environment.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ong, Pheng Yen. The Effects of Positive Reinforcement and Punishment on Upper Primary Pupil's Disruptive Behaviour and Their Perceptions of the Classroom Environment. 1987.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ong, Pheng Yen. The Effects of Positive Reinforcement and Punishment on Upper Primary Pupil's Disruptive Behaviour and Their Perceptions of the Classroom Environment. 1987.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.