Tuan Sarifah Aini Syed Ahmad. (2003). The usability of online grammar quizzes as supplementary material in the teaching of the simple past tense. Fakulti Sains Sosial dan Kemanusiaan, Universiti Kebangsaan Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Tuan Sarifah Aini Syed Ahmad. The Usability of Online Grammar Quizzes as Supplementary Material in the Teaching of the Simple Past Tense. Bangi: Fakulti Sains Sosial dan Kemanusiaan, Universiti Kebangsaan Malaysia, 2003.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Tuan Sarifah Aini Syed Ahmad. The Usability of Online Grammar Quizzes as Supplementary Material in the Teaching of the Simple Past Tense. Fakulti Sains Sosial dan Kemanusiaan, Universiti Kebangsaan Malaysia, 2003.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.