Zul Shaharuddin bin Setapa @ Mustafa. (2012). Mystical elements in Walt Whitman's Leaves of Grass: A study of 'Inscriptions' and 'Children of Adam'. Kulliyyah of Islamic Revealed Knowledge and Human Sciences,International Islamic University Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Zul Shaharuddin bin Setapa @ Mustafa. Mystical Elements in Walt Whitman's Leaves of Grass: A Study of 'Inscriptions' and 'Children of Adam'. Kuala Lumpur: Kulliyyah of Islamic Revealed Knowledge and Human Sciences,International Islamic University Malaysia, 2012.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Zul Shaharuddin bin Setapa @ Mustafa. Mystical Elements in Walt Whitman's Leaves of Grass: A Study of 'Inscriptions' and 'Children of Adam'. Kulliyyah of Islamic Revealed Knowledge and Human Sciences,International Islamic University Malaysia, 2012.