1. Abramson, A. S. (1962). The vowels and Tones of Standard Thai: Acoustical measurements and experiments. Indiana University Research Center in Anthropology, Folklore, and Linguistics: Bloomington, Publication 20.
2. Tonal experiments with whispered Thai;Abramson,1972
3. The tones of Central Thai: Some perceptual experiments;Abramson,1975
4. The noncategorical perception of tone categories in Thai;Abramson,1979
5. Avelino, H. (2003). Categorical perception of phonemic tone in Yalálag Zapotec. In Proceedings of the 15th International Congress of the Phonetic Sciences.