1. CP: 1931–58. The Collected Papers of Charles Sanders Peirce. 8 vols. Edited by C. Hartshome, P. Weiss, and A. Burks (Cambridge, Mass.: Harvard University Press).
2. EP: 1992–98. The Essential Peirce. 2 vols. Edited by the Peirce Edition Project, Nathan Houser, and Christian Kloesel (Bloomington, Ind.: Indiana University Press).
3. MS: The Charles S. Peirce Papers (Cambridge, Mass: Houghton Library at Harvard).
4. PPM: 1997. Pragmatism as a Principle and Method of Right Thinking: The 1903 Harvard Lectures on Pragmatism. Edited by Patricia Tunisi (Buffalo, NY: State University of New York Press, 1997).
5. W: 1982-. The Writings of Charles S. Peirce. 8 vols. Edited by the Peirce Edition Project (Bloomington, Ind.: Indiana University Press).