(en) Jan Ullrich, New Lakota Dictionary : Lakhótiyapi-English : English-Lakhótiyapi & Incorporating the Dakota Dialects of Santee-Sisseton and Yankton-Yanktonai, Bloomington (Indiana), Lakota Language Consortium, Bloomington, , 1100 p. (ISBN978-0-9761082-9-0, LCCN2008922508)