توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)
Hegel, G. W. F., Knox, T. M., Acton, H. B., & Silber, J. (1975). Natural law: The scientific ways of treating natural law, its place in moral philosophy, and its relation to the positive sciences of law. University of Pennsylvania Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)
Hegel, Georg Wilhelm Friedrich, T. M. Knox, H. B. Acton, و John Silber. Natural Law: The Scientific Ways of Treating Natural Law, Its Place in Moral Philosophy, and Its Relation to the Positive Sciences of Law. [Philadelphia]: University of Pennsylvania Press, 1975.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)
Hegel, Georg Wilhelm Friedrich, et al. Natural Law: The Scientific Ways of Treating Natural Law, Its Place in Moral Philosophy, and Its Relation to the Positive Sciences of Law. University of Pennsylvania Press, 1975.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.