Ploog, D. W. Max Planck Institute of Psychiatry, Max Planck Society;
Ploog, D. W. (1992). The evolution of vocal communication. In H. Papousek, U. Jürgens, & M. Papousek (Eds.), Nonverbal Vocal Communication: Comparative and Developmental Approaches (pp. 6-30). Cambridge; Paris: Cambridge University Press; Editions de la Maison des Sciences de l`Homme.