1. Preston (2011) summarizes perceptual dialectology and related techniques discussed in Section 10.2.6.
2. Blair (1990) introduces a number of the techniques discussed in Section 10.2.
3. Yuan Yichuan , 2005. Attitude and Motivation of English Learning of Ethnic Minority Students in China. PhD thesis, La Trobe University.
4. Nisu dialect geography;Yang;Summer Institute of Linguistics Electronic Survey Reports,2009