|  | De Dialectica libri VI, p. 54/145 of the PDF file, by Rivius, Johann | 1555 | Classical Sigma-2 | 3 | Rectangle |
|  | Institutiones philosophicae ad faciliorem veterum, ac recentiorum philosophorum lectionem comparatae. Tomus primus. Complectens Logicam, & Metaphysicam, p. 127, by Pourchot, Edmond | 1715 | Classical Sigma-2 | 3 | Square |
|  | Opposition of Compound Propositions, p. 79, by Bahm, Archie J. | 1946 | Classical Sigma-2 | 3 | Square |
|  | Opposition of Compound Propositions, p. 79, by Bahm, Archie J. | 1946 | Classical Sigma-2 | 3 | Square |
|  | Opposition of Compound Propositions, p. 79, by Bahm, Archie J. | 1946 | Classical Sigma-2 | 3 | Square |
|  | Institutiones dialecticae, p. 101, by Schetzer, Johann | 1745 | Classical Sigma-2 | 3 | Rectangle |
|  | Tractatus de dialectica, fol. 62v, anonymous | 1201–1400 | Classical Sigma-2 | 3 | Rectangle |
|  | Towards a Logic of Argumentation, p. 560, by Amgoud, Leila; Prade, Henri | 2012 | Classical Sigma-2 | 3 | Rectangle |
|  | Towards a Logic of Argumentation, p. 560, by Amgoud, Leila; Prade, Henri | 2012 | Classical Sigma-2 | 3 | Rectangle |
|  | Leibniz and the Square: A Deontic Logic for the Vir Bonus, p. 370, by Johns, Chris | 2014 | Classical Sigma-2 | 3 | Rectangle |
|  | Towards a Logic of Argumentation, p. 561, by Amgoud, Leila; Prade, Henri | 2012 | Classical Sigma-2 | 3 | Rectangle |
|  | Towards a Logic of Argumentation, p. 562, by Amgoud, Leila; Prade, Henri | 2012 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |
|  | Towards a Logic of Argumentation, p. 564, by Amgoud, Leila; Prade, Henri | 2012 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |
|  | Handbook of Logic, p. 32, by Morell, John Daniel | 1857 | Classical Sigma-2 | 3 | Square |
|  | Avicenna on Possibility and Necessity, p. 334, by Chatti, Saloua | 2014 | Classical Sigma-2 | 3 | Rectangle |
|  | Avicenna on Possibility and Necessity, p. 334, by Chatti, Saloua | 2014 | Classical Sigma-2 | 3 | Rectangle |
|  | Avicenna on Possibility and Necessity, p. 341, by Chatti, Saloua | 2014 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |
|  | Avicenna on Possibility and Necessity, p. 344, by Chatti, Saloua | 2014 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |
|  | Avicenna on Possibility and Necessity, p. 333, by Chatti, Saloua | 2014 | Classical Sigma-2 | 3 | Square |
|  | Avicenna on Possibility and Necessity, p. 345, by Chatti, Saloua | 2014 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |
|  | Précis de philosophie, p. 226, by Rabier, Élie; Worms, René (ed.) | 1891 | Classical Sigma-2 | 3 | Square |
|  | Logicae seu Philosophiae Rationalis Elementa, p. 43, by Ubaghs, Gerard Casimir | 1856 | Classical Sigma-2 | 3 | Rectangle |
|  | Une exception allemande: la traduction du De Interpretatione par le Professeur Gohlke. La note 10 sur les indéterminées d'Aristote, p. 410, by Monteil, Jean-François | 2001 | Classical Sigma-2 | 3 | Rectangle |
|  | Cours élémentaire de philosophie classique, p. 245, by Regnault, Ernest | 1885 | Classical Sigma-2 | 3 | Rectangle |
|  | Dialectica ludicra, fol. 61, by Nifo, Agostino | 1521 | Classical Sigma-2 | 3 | Square |