| 4- Gerardus Heijdra, Michel 2009 Darwinian Explanations of the Origin of Language, Universiteit Amsterdam 5- Janis B | Fisher 1988 Comparison of Associations to Vowel Speech Sounds by English and Spanish Speakers |
|---|---|
| Nuckolls 1999 Annual Review of Anthropology Vol | Cambridge: Cambridge university press 7- Tsur, Reuven 1992 What makes sound patterns expressive? The American Journal of Psychology 101 |