Obert, K. B., & Chicurel, S. R. (2005). Geography of the voice.
芝加哥风格引文Obert, Kerrie B., 与 Steven R. Chicurel. Geography of the Voice. Think Voice International, 2005.
MLA引文Obert, Kerrie B., 与 Steven R. Chicurel. Geography of the Voice. 2005.
警告：这些引文格式不一定是100％准确.