Shi, Youwei. 1999. `bēi‘ yīn shuō yí \zh{“背”音说疑} [Interrogations about the pingsheng reading of the character \zh{背}]. Hànyǔ xuéxí \zh{汉语学习} 5. 45-46.
@article{jacquesestimative-shiyw99bei, author = {Shi, Youwei}, journal = {Hànyǔ xuéxí \zh{汉语学习}}, pages = {45-46}, title = {`bēi‘ yīn shuō yí \zh{“背”音说疑} [Interrogations about the pingsheng reading of the character \zh{背}]}, volume = {5}, year = {1999} }