There is a nice hyperlinked grouping of the parables into thematic categories (work and wages, fathers and sons, etc.) at the Daily Scripture website.
There is a nice essay by Madelaine Boucher on parables at the PBS website.
You can find different translations of the Gospel of Thomas online, and the entire Nag Hammadi Library is also available online.
MLLL-2003. World Literature: Frametales. Laura Gibbs, Ph.D.
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