Norfazlika binti Abd. Karim. (2010). Introversion - extroverstion factors and the ESL proficiency (listening and speaking) level of UiTM Melaka students. Kulliyyah of Islamic Revealed Knowledge and Human Sciences, International Islamic University Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Norfazlika binti Abd. Karim. Introversion - Extroverstion Factors and the ESL Proficiency (listening and Speaking) Level of UiTM Melaka Students. Gombak, Selangor: Kulliyyah of Islamic Revealed Knowledge and Human Sciences, International Islamic University Malaysia, 2010.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Norfazlika binti Abd. Karim. Introversion - Extroverstion Factors and the ESL Proficiency (listening and Speaking) Level of UiTM Melaka Students. Kulliyyah of Islamic Revealed Knowledge and Human Sciences, International Islamic University Malaysia, 2010.