1. Bao, Z. (2011). Chinese Tone Sandhi. In The Blackwell Companion to Phonology (Vol. 5, pp. 2561–2585). Wiley.
2. Barnes, J. (2006). Strength and weakness at the interface: Positional neutralization in phonetics and phonology. (A. ti Lahiri, Ed.). Walter de Gruyter.
3. Barrie, M. (2006). Tone circles and contrast preservation. Linguistic Inquiry, 37(1), 131–141.
4. Bodman, N. C. (1955). Spoken Amoy Hokkien. Kuala Lumpur.
5. Beckman, M. E., & Pierrehumbert, J. B. (1986). Intonational structure in Japanese and English. Phonology, 3(1), 255–309.