Hakaku, (edited ) 
‘Rikka, Uchinaa-nkai! Okinawan Language Textbook for Beginners’ (2017)
Web page: https://liuchiuan.com/2017/09/13/rikka-uchinaa-nkai-okinawan-language-textbook-for-beginners-2017/
Direct link to PDF: https://liuchiuan.files.wordpress.com/2017/09/rikka_2nded_final.pdf
Great work for learners. Has a lot of exercises for practice..
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