1. Aikhenvald, Alexandra. 2004. Evidentiality. Oxford: Oxford University Press.
2. Anderson, Lloyd B. 1986. Evidentials, paths of change, and mental maps: Typologically regular asymmetries. In Chafe Wallace & Johanna Nichols (eds.), Evidentiality: The linguistic coding of epistemology, 143–169. Norwood, NJ: Ablex.
3. Bybee, Joan L. 1985. Morphology: A study of the relation between meaning and form. Amsterdam: John Benjamins.
4. Chafe, Wallace. 1986. Evidentiality in English conversation and academic writing. In Chafe Wallace & Johanna Nichols (eds.), Evidentiality: The linguistic coding of epistemology, 261–272. Norwood, NJ: Ablex.
5. Cheng, Le. 2007. Identification and appraisal of intergenericity in judgments. Journal of Zhejiang Gongshang University 83(2). 32–37.