Gotthelf, A., & Lennox, J. G. (2013). Concepts and their role in knowledge: Reflections on objectivist epistemology. University of Pittsburgh Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Gotthelf, Allan, و James G. Lennox. Concepts and Their Role in Knowledge: Reflections on Objectivist Epistemology. Pittsburgh, Pennsylvania: University of Pittsburgh Press, 2013.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Gotthelf, Allan, و James G. Lennox. Concepts and Their Role in Knowledge: Reflections on Objectivist Epistemology. University of Pittsburgh Press, 2013.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.