Yulgok
Links
History of Tae Kwon Do: Yulgok
http://www.franklinsidekicks.com/YiYi.htm
Concise biography of this Korean thinker.
Ojukheon Municipal Museum
Place where Yulgok and his mother, Shin Saimdang, lived. Information on buildings, exhibits, and history.
Yulgok Yi I (1536-1584)
http://homepage.ruhr-uni-bochum.de/Sven.K.Herbers-Lee/dateien/ygyy.html
Bibliography of primary and secondary sources in various languages.