W Writings of Charles S. Peirce: A Chronological Edition, ed. Edward Moore, ChristianJ.W Kloesel, et al. 5 volumes to date. Bloomington: Indiana University Press, 1982- References in text indicate volume and page number (W 1:11)
CLL Chance, Love and Logic: Philosophical Essays, ed. Morris R. Cohen, Bison Books Edition, with introduction by Kenneth Laine Ketner, Lincoln and London: University of Nebraska Press, 1998. References in text indicate part and page number (CLL 1:1)
CP Collected Papers of Charles Sanders Peirce, Volumes 1-6 edited by Charles Hartshorne, Paul Weiss. Volumes 7-8 edited by Arthur Burks. Cambridge: Harvard University Press. References in text indicate volume and paragraph number (CP 1.11)
NEM The New Elements of Mathematics, ed. Carolyn Eisele. The Hague: Mouton de Gruyter, 1976. Threee volumes. References in text indicate volume and page number: (NEM 1:11)
MS The Charles S. Peirce Papers, Houghton Library, Harvard University, Reference is to the system of categorization in R.S. Robin, The Annotated Catalogue of the Charles S. Peirce Papers, and. R.S. Robin, The Peirce Papers: A Supplementary Catalogue. Page number and date are included if necessary as in (MS 1, 1, 1902)