2009 World Yo-Yo Contest
Recreation, Collecting, Toys, Yo-Yos - World Yo-Yo Contest. Rules, trick lists with video demonstrations, location, and daily schedule.
https://www.worldyoyocontest.com/
Bob Rule Archives
Recreation, Collecting, Toys, Yo-Yos - Bob Rule. The last demonstrator to be employed by Duncan, before the company passed out of family control.
http://www.mryoyo.com/
spinningtoys.com
Recreation, Collecting, Toys, Yo-Yos - SpinningToys.com. Includes museum, personal collections, manufacturers' histories, and detailed guides to yo-yos and tops.
http://www.spinningtoys.com/