1. Lengthening and shortening and the nature of prosodic constituency;Beckman,1990
2. Intonational structure in Japanese and English;Beckman;Phonology Yearbook,1986
3. Boersma, P., & Weenink, D. (2008). Praat: Doing phonetics by computer (Version 5.3.04) [Computer program]. Retrieved 16.10.08.
4. The verbal environment of the language-learning child;Broen;Monograph of American Speech and Hearing Association,1972
5. Syntax and speech;Cooper,1980