Graumann, Carl F., and Theo Herrmann (eds.) 1989. Speakers: the role of the listener. Avon, UK: Multilingual Matters.
Johnson, Keith, and John W. Mullennix (eds.) 1997. Talker variability in speech processing. San Diego, CA: Academic Press.
Meyer, Julien. 2008. Typology and acoustic strategies of whistled languages: Phonetic comparison and perceptual cues of whistled vowels. Journal of the International Phonetic Association 38.69-94.
Shrivastav, Rahul. 2006. Perceptual attributes and assessment of the singer's voice. The performer's voice, ed. by Michael S. Benninger and Thomas Murry, 103-115. Abingdon, UK: Plural Publishing.
*The research bibliography is evolving daily. Represented above is an as yet un-categorized sample of a few preliminary resources