TY  - BOOK
AU  - Lieberman,Philip
TI  - On the origins of language: an introduction to the evolution of human speech 
SN  - 0023706902
PY  - 1975///
CY  - New York
PB  - MacMillan
KW  - Language and languages
KW  - Origin
N1  - Bibliography: p. 183-189
ER  -