Lukmanul Hakim. (2005). Classificatory model and user evaluation of CATCHA.COM.MY: A Malaysian web portal. Kulliyyah of Information and Communication Technology, International Islamic University Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Lukmanul Hakim. Classificatory Model and User Evaluation of CATCHA.COM.MY: A Malaysian Web Portal. Gombak, Selangor: Kulliyyah of Information and Communication Technology, International Islamic University Malaysia, 2005.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Lukmanul Hakim. Classificatory Model and User Evaluation of CATCHA.COM.MY: A Malaysian Web Portal. Kulliyyah of Information and Communication Technology, International Islamic University Malaysia, 2005.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.