Modern-South-Arabian-Languages: (Mehri Soqotri Shehri Bathari Harsusi Hobyot)
And there's a bunch of Brill publications : About Mehri, Soqotri and Jibbali - most of them accessible for free on Brills 'online version' of the books , the Soqotri book has the audio recordings of narrated stories, with text transliterated in Latin and Arabic script, translated into both English and Fuṣẖa Arabic:: Corpus of Soqotri Oral Literature / The Mehri Language of Oman / Jibbali (Shaḥri) Language of Oman :: http://booksandjournals.brillonline.com/content/books/9789004278400 http://booksandjournals.brillonline.com/content/books/9789004187627 http://booksandjournals.brillonline.com/content/books/9789004262850
https://www.leeds.ac.uk/arts/downloads/125219/modern_south_arabian_languages/
2018 - summary and bibliography to the state of research of the Modern-South-Arabian-Languages: https://www.academia.edu/42613361/A_sketch_of_the_Kuria_Muria_language_variety_and_other_aspects_of_Modern_South_Arabian