Ruhlen, Merritt..
The origin of language : tracing the evolution of the mother tongue /

. - New York ; Chichester ; Brisbane  : John Wiley & Sons., Inc.,  1994 
. - xi, 239 p. : ill., map., tab.  24 cm. 
<br/>К.: Бібліогр. : с. 216-224. 
<br/><label>  ISBN: </label>0-471-58426-6