Mayer, T. (2001). On existence and its causes: The fourth Namat of Avicenna's Isharat and its main commentaries. St. Cross College (University of Oxford).
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Mayer, Toby. On Existence and Its Causes: The Fourth Namat of Avicenna's Isharat and Its Main Commentaries. Oxford: St. Cross College (University of Oxford), 2001.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Mayer, Toby. On Existence and Its Causes: The Fourth Namat of Avicenna's Isharat and Its Main Commentaries. St. Cross College (University of Oxford), 2001.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.