Nor Farida bt. Ahmad. (2009). Error analysis in the written English spelling of form four students in Sekolah Berasrama Penuh Integrasi, Gombak, Kuala Lumpur. Kulliyyah of Islamic Revealed Knowledge and Human Sciences, International Islamic University Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Nor Farida bt. Ahmad. Error Analysis in the Written English Spelling of Form Four Students in Sekolah Berasrama Penuh Integrasi, Gombak, Kuala Lumpur. Gombak, Selangor: Kulliyyah of Islamic Revealed Knowledge and Human Sciences, International Islamic University Malaysia, 2009.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Nor Farida bt. Ahmad. Error Analysis in the Written English Spelling of Form Four Students in Sekolah Berasrama Penuh Integrasi, Gombak, Kuala Lumpur. Kulliyyah of Islamic Revealed Knowledge and Human Sciences, International Islamic University Malaysia, 2009.