ZIKMUNDOVÁ, Veronika. Spoken Sibe : morphology of the inflected parts of speech. 1st ed. Prague : Karolinum, 2013. 1 online zdroj (231 s.). Available on Internet: <https://ebookcentral.proquest.com/lib/ujep-ebooks/detail.action?docID=2012882> ISBN 978-80-246-2489-1.