Scholasticism - http://www.nd.edu/Departments/Maritain/etext/scholas1.htm Online text by Joseph Rickaby (1908).
Aristotle's Reform of Paideia - http://www.bu.edu/wcp/Papers/Anci/AnciBark.htm Article by Evelyn Barker, arguing that the principal aim of Aristotle's Organon was to reform the contemporary paedagogical role of dialectic.
Scholastic Logic - http://www.nd.edu/Departments/Maritain/etext/perrier2.html Chapter Two of Joseph Perrier's "The Revival of Scholastic Philosophy in the Nineteenth Century" (1909).
Medieval Theories of Modality - http://plato.stanford.edu/entries/modality-medieval/ Article at the Stanford Encyclopaedia of Philosophy.
Peter of Spain (Petrus Hispanus) - http://plato.stanford.edu/entries/peter-spain/ Life and work of 13th century logician and author of the Tractatus; from the Stanford Encyclopedia by Joke Spruyt.
Medieval Theories of Analogy - http://plato.stanford.edu/entries/analogy-medieval/ Entry in the Stanford Encyclopaedia of Philosophy, by E. Jennifer Ashworth.
Square of Opposition - http://plato.stanford.edu/entries/square/ Article in the Stanford Encyclopaedia of Philosophy, by Terence Parsons.
On Dialectic - http://www9.georgetown.edu/faculty/jod/texts/dialecticatrans.html By St. Augustine. Latin original together with translation by J. Marchand.
Aristotle's Logic - http://www.philosophypages.com/hy/2n.htm Introductory article by Garth Kemerling.
The Summulae of John Buridan - http://www.fordham.edu/gsas/phil/klima/Intro.htm A critical introduction by Gyula Klima.
Logic - http://www.newadvent.org/cathen/09324a.htm Entry in the Catholic Encyclopaedia (1917), dominated by a historical survey from Indian and Pre-Aristotelian philosophy to the Logic of John Stuart Mill.
Syllogistic logic online - http://aristotelianlogic.glashoff.net This site contains an online program for studying Aristotle's syllogistic logic. The theory of Aristotle's ancient logic is also presented.
Mediaeval Logic and Philosophy - http://pvspade.com/Logic/ Resource maintained by Paul Vincent Spade at Indiana University.
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