1. Reed SF, Ohel G, David R, Porges SW (1999) A neural explanation of fetal heart rate patterns: a test of the polyvagal theory. Dev Psychobiol 35(2):108–118
2. Porges SW (2007) The polyvagal perspective. Biol Psychol 74(2):116–143
3. Kolacz J, Lewis GF, Porges SW (2018) The integration of vocal communication and biobehavioral state regulation in mammals: a polyvagal hypothesis. In: Handbook of behavioral neuroscience, vol 25. Elsevier, London, pp 23–34
4. Porges SW (2009) The polyvagal theory: new insights into adaptive reactions of the autonomic nervous system. Cleve Clin J Med 76(Suppl 2):S86
5. Porges SW (2011) The polyvagal theory: neurophysiological foundations of emotions, attachment, communication, and self-regulation. W.W. Norton, New York