Aenigmata: The early Medieval riddle collections by Symphosius and Aldhelm (in Latin), with an introduction.
Ambiguity, Classification and Change: The Function of Riddles: Article by Ian Hamnett discussing how riddling reflects social structures, illustrated by Bantu riddles.
Grecian Riddle-Jokes: Article by Evangelos Gr.Avdikos on riddle-jokes, which use word patching for parodying social situations.
Homefun on Riddles: A guide to general questions about riddles, their significances, and forms.
Mambila Riddle Machine: Interactive introduction to riddles collected in the village of Somié, Cameroon.
Old English Riddles: Paper by Hazel Brewer on the history of Old English riddles.
Sexual Riddles: The Test of The Listener: Article by Annikki Kaivola-Bregenhøj discussing the history and context of sexual riddles.
Sirandanes - Riddles: Riddles of Mauritia in Mauritian Creole, French and English.
The Morrison Collection - Dengmi Yadiao: Collection of 67 Chinese lantern riddles (in Chinese) with introduction, from a collection of Chinese books at SOAS.
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.
Yahoo! Groups: ClassicRiddles: Forum keeping the classic rhyming riddles alive.