WikiPedia:K_programming_language,
WardsWiki:KayLanguage, WardsWiki:ArrayOrientedLanguage.
Siehe
Homepage, Dokumentation, Vertrieb, Download (K-Lite), ...: http://kx.com/
K User Manual (PDF): 
http://www.kx.com/technical/documents/kusrlite.pdf
"A Shallow Introduction to the K Programming Language": http://www.kuro5hin.org/story/2002/11/14/22741/791