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://haldjas.folklore.ee/folklore/vol10/minorf.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/

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

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

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

Versification of Vietnamese Riddles  
   Discussion by Cong-Huyen-Ton-Nu Nha-Trang on stylistic features as a means to distinguish the riddle from other genres of folk poetry.
   http://www.geocities.com/chtn_nhatrang/riddles.html

Syllabus for Puzzling Narratives  
   Online course materials exploring the function of charms and riddles in traditional and modern literature.
   http://www.eiu.edu/~multilit/english4390-f00/syllabus.htm

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

Homefun on Riddles  
   A guide to general questions about riddles, their significances, and forms.
   http://www.siskiyous.edu/class/engl12/RIDDLES.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://uk.geocities.com/Morrison1782/Texts/DengmiYadiao.html

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