Gotthelf, A., & Lennox, J. G. (2013). Concepts and their role in knowledge: Reflections on objectivist epistemology. University of Pittsburgh Press.

Gotthelf, Allan, and James G. Lennox. Concepts and Their Role in Knowledge: Reflections on Objectivist Epistemology. Pittsburgh, Pennsylvania: University of Pittsburgh Press, 2013.

Gotthelf, Allan, and James G. Lennox. Concepts and Their Role in Knowledge: Reflections on Objectivist Epistemology. University of Pittsburgh Press, 2013.