- Mediaeval Logic and Philosophy - http://pvspade.com/logic/
- Resource maintained by Paul Vincent Spade at Indiana University.
- The Summulae of John Buridan - http://www.fordham.edu/gsas/phil/klima/intro.htm
- A critical introduction by Gyula Klima.
- Medieval Theories of Analogy - http://plato.stanford.edu/entries/analogy-medieval/
- Entry in the Stanford Encyclopaedia of Philosophy, by E. Jennifer Ashworth.
- Medieval Theories of Modality - http://plato.stanford.edu/entries/modality-medieval/
- Article at the Stanford Encyclopaedia of Philosophy.
- 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).
- 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.
- Square of Opposition - http://plato.stanford.edu/entries/square/
- Article in the Stanford Encyclopaedia of Philosophy, by Terence Parsons.
- 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.
- Aristotle's Logic - http://www.philosophypages.com/hy/2n.htm
- Introductory article by Garth Kemerling.
- 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.
- 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.
- Earliest Uses of Symbols of Set Theory and Logic - http://members.aol.com/jeff570/set.html
- Explains the early introduction of notations used in logic and set theory as we know it today. Includes reference links to key people in this area.
- On Dialectic - http://www9.georgetown.edu/faculty/jod/texts/dialecticatrans.html
- By St. Augustine. Latin original together with translation by J. Marchand.
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