Norharti Jalil. (2002). A study on the effectiveness of groups vs individual work in teaching free writing composition to form five students. Fakulti Pengajian Bahasa, Universiti Kebangsaan Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Norharti Jalil. A Study on the Effectiveness of Groups Vs Individual Work in Teaching Free Writing Composition to Form Five Students. Bangi: Fakulti Pengajian Bahasa, Universiti Kebangsaan Malaysia, 2002.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Norharti Jalil. A Study on the Effectiveness of Groups Vs Individual Work in Teaching Free Writing Composition to Form Five Students. Fakulti Pengajian Bahasa, Universiti Kebangsaan Malaysia, 2002.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.