1. Heaton, J.B.: Writing English Language Tests (1988)
2. Bachman, L.F., Palmer, A.S.: Language Testing in Practice: Designing and Developing Useful Language Tests, vol. 1. Oxford University Press (1996)
3. Chen, H., Li, J.N.: Reflections on the current situation of phonological assessment: a survey among raters of standardized oral tests in China. Foreign Lang. Their Teach. 5, 81–87 (2017)
4. Levis, J.M.: Pronunciation and the Assessment of Spoken Language. Spoken English, TESOL and Applied Linguistics, pp. 245–270. Palgrave Macmillan, London (2006)
5. Franco, H., et al.: Automatic pronunciation scoring for language instruction. In: 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing, vol. 2. IEEE (1997)