Aenigmata
   The early Medieval riddle collections by Symphosius and Aldhelm (in Latin), with an introduction.
   http://personal.bgsu.edu/~jmpfund/Aenigmata.html

Ambiguity, Classification and Change: The Function of Riddles
   Article by Ian Hamnett discussing how riddling reflects social structures, illustrated by Bantu riddles.
   http://www.era.anthropology.ac.uk/Era_Resources/Era/Riddles/hamnet.html

Grecian Riddle-Jokes
   Article by Evangelos Gr.Avdikos on riddle-jokes, which use word patching for parodying social situations.
   http://folklore.ee/folklore/vol10/minorf.htm

Homefun on Riddles
   A guide to general questions about riddles, their significances, and forms.
   http://www.siskiyous.edu/class/engl12/RIDDLES.htm

Mambila Riddle Machine
   Interactive introduction to riddles collected in the village of Somié, Cameroon.
   http://www.era.anthropology.ac.uk/Era_Resources/Era/Riddles/

Old English Riddles
   Paper by Hazel Brewer on the history of Old English riddles.
   http://www.chass.utoronto.ca/~cpercy/courses/1001Brewer.htm

Sexual Riddles: The Test of The Listener
   Article by Annikki Kaivola-Bregenhøj discussing the history and context of sexual riddles.
   http://cc.joensuu.fi/~loristi/1_97/kai197.html

Sirandanes - Riddles
   Riddles of Mauritia in Mauritian Creole, French and English.
   http://www.kreol.mu/Sirandanes_1.htm

The Morrison Collection - Dengmi Yadiao
   Collection of 67 Chinese lantern riddles (in Chinese) with introduction, from a collection of Chinese books at SOAS.
   http://www.babelstone.co.uk/Morrison/Texts/DengmiYadiao.html

Yahoo! Groups: ClassicRiddles
   Forum keeping the classic rhyming riddles alive.
   http://groups.yahoo.com/group/ClassicRiddles/