1. Abercrombie, D. (1967). Elements of general phonetics. Edinburgh University Press.
2. Aitken, C. C. G. (1995). Statistics and the evaluation of evidence for forensic scientists. John Wiley & Sons.
3. Amilon, K., Van de Weijer, J., & Schötz, S. (2007). The impact of visual and auditory cues in age estimation. In C. Müller (Ed.), Speaker classification II. Lectures notes in artificial intelligence (pp. 10–21). Springer.
4. Anonymous. (1998). The voiceprint dilemma: Should voices be seen and not heard? Maryland Law Review, 35(2), 267–296.
5. Baldwin, J., & French, F. (1990). Forensic phonetics. Pinter.