  |
Mediaeval Logic and Philosophy - http://pvspade.com/Logic/
Resource maintained by Paul Vincent Spade at Indiana University. |
  |
Medieval Theories of Modality - http://plato.stanford.edu/entries/modality-medieval/
Article at the Stanford Encyclopaedia of Philosophy. |
  |
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. |
  |
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. |