Kleinewillinghöfer, Ulrich (December 2010). Jalaa, the last member of an extinct language family. Workshop Language Isolates in Africa. Lyon, France; which in words of the author is a revised edition of Kleinewillinghöfer, Ulrich (2001). "Jalaa - An almost forgotten language of NE Nigeria: A language isolate". Nurse, Derek (Ed.). Historical Language Contact in Africa. SUGIA Sprache und Geschichte in Afrika. 16/17. Cologne, Germany: Rüdiger Köppe Verlag. ss.239-271. ISBN978-3-89645-091-3.