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|   | * Peirce, C.S. (1885), “On the Algebra of Logic : A Contribution to the Philosophy of Notation”, ''American Journal of Mathematics'' 7 (1885), 180–202.  Reprinted as CP 3.359–403 and CE 5, 162–190.  |   | * Peirce, C.S. (1885), “On the Algebra of Logic : A Contribution to the Philosophy of Notation”, ''American Journal of Mathematics'' 7 (1885), 180–202.  Reprinted as CP 3.359–403 and CE 5, 162–190.  | 
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| − | * Peirce, C.S. (c. 1886), “Qualitative Logic”, MS 736.  Published as pp. 101–115 in Carolyn Eisele (ed., 1976), ''The New Elements of Mathematics by Charles S. Peirce, Volume 4, Mathematical Philosophy'', Mouton, The Hague.  | + | * Peirce, C.S. (c. 1886), “Qualitative Logic”, MS 736.  Published as pp. 101–115 in Carolyn Eisele (ed., 1976), ''The New Elements of Mathematics by Charles S. Peirce, Volume 4, Mathematical Philosophy'', Mouton, The Hague.  | 
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|   | * Peirce, C.S. (1886 a), “Qualitative Logic”, MS 582.  Published as pp. 323–371 in ''Writings of Charles S. Peirce : A Chronological Edition, Volume 5, 1884–1886'', Peirce Edition Project (eds.), Indiana University Press, Bloomington, IN, 1993.  |   | * Peirce, C.S. (1886 a), “Qualitative Logic”, MS 582.  Published as pp. 323–371 in ''Writings of Charles S. Peirce : A Chronological Edition, Volume 5, 1884–1886'', Peirce Edition Project (eds.), Indiana University Press, Bloomington, IN, 1993.  | 
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|   | * Peirce, C.S. (1886 b), “The Logic of Relatives : Qualitative and Quantitative”, MS 584.  Published as pp. 372–378 in ''Writings of Charles S. Peirce : A Chronological Edition, Volume 5, 1884–1886'', Peirce Edition Project (eds.), Indiana University Press, Bloomington, IN, 1993.  |   | * Peirce, C.S. (1886 b), “The Logic of Relatives : Qualitative and Quantitative”, MS 584.  Published as pp. 372–378 in ''Writings of Charles S. Peirce : A Chronological Edition, Volume 5, 1884–1886'', Peirce Edition Project (eds.), Indiana University Press, Bloomington, IN, 1993.  | 
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| − | * Spencer Brown, George (1969), ''[[Laws of Form]]'', George Allen and Unwin, London, UK.  | + | * Spencer Brown, George (1969), ''Laws of Form'', George Allen and Unwin, London, UK.  | 
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|   | ==See also==  |   | ==See also==  |