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The following recent Open Access book could be included under bibliography. I have a conflict of interest, so I post this on the talk page.
Catherine Rudin & Gordon, James Bryan (eds.) 2016. Advances in the study of Siouan languages and linguistics (Studies in Diversity Linguistics 10). Berlin: Language Science Press. http://langsci-press.org//catalog/book/94 ISBN: 978-3-946234-37-1 doi: 10.17169/langsci.b94.118 — Preceding unsigned comment added by Jasy jatere (talk • contribs) 13:33, 30 May 2016
Done. That's quite a goodie, I've added it now to the article. Thanks! Uanfala (talk) 21:40, 1 June 2016 (UTC)