- 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.
- Excerpt from Peter of Spain - http://www.humnet.ucla.edu/humnet/phil/faculty/tparsons/phil107/p_spain.htm
A brief passage from the Treatise on Distributions, in Joseph Mullally's translation. Discusses the problem of whether the negation of a statement makes it universal or renders it indeterminate.
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