1. Kent RD, Ball MJ: Voice Quality Measurement. San Diego, Singular Publishing Group, 2000.
2. Baken RJ, Orlikoff RF: Clinical Measurement of Speech and Voice, ed 2. San Diego, Singular Publishing Group, 2000.
3. Titze IR: Workshop on Acoustic Voice Analysis: Summary Statement. Iowa City, National Center for Voice and Speech, 1995.
4. Required Number of Tokens to Determine Representative Voice Perturbation Values
5. Effect of Microphone Type and Placement on Voice Perturbation Measurements