1996, Peter T. Daniels, ‎William Bright, The World's Writing Systems (ISBN 0195079930), page 26:Seycong or his linguistic consultants could use as a model the alphabetic or abugidic scripts of India and Inner Asia ...
2008, Mark Aronoff, ‎Janie Rees-Miller, The Handbook of Linguistics (ISBN 0470756349), page 62:... and the script ... is modeled closely on Tibetan as to shape (though severely squared up) but is written in columns; it retains the abugidic principle, but places all the non-a vowel indicators after (i.e. below) the consonant they follow ...
2000, Chin-u Kim, Literacy and writing systems in Asia, page 77:The earliest Tibetan inscriptions date from the 8th or 9th century, and Tibetan writing is based in the Brahmi family. It preserves the abugidic nature of its forebears, using appendages for the vowels ...
