ebrary, Inc, Doolan, G. T., & Wippel, J. F. (2012). The science of being as being: Metaphysical investigations. Catholic University of America Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)ebrary, Inc, Gregory T. Doolan, و John F. Wippel. The Science of Being as Being: Metaphysical Investigations. Washington, DC: Catholic University of America Press, 2012.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)ebrary, Inc, et al. The Science of Being as Being: Metaphysical Investigations. Catholic University of America Press, 2012.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.