Double Multievents - Double decathlon, double weight pentathlon and other extreme track and field multi-events. - http://www.icosathlon.net/
Decathlon 2000 - News, statistics and information about the decathlon, including biographies of famous decathletes. - http://www.decathlon2000.ee/eng/index.php
USA Combined Events: Decathlon and Heptathlon - Resources gathered by the USA Track and Field Association regarding these two sports, including links, events and results, and competitors. - http://www.usatf.org/heptathlon/
DECA - the Decathlon Association - Resources, results, records, event information, history, links and news in the world of Olympic, college and high school decathlon. - http://www.decathlonusa.org