TY  - BOOK
AU  - Postman Neil
AU  -  Damon Howard C
TI  - Language and systems
U1  - P:(R), K72 (PD) 
PY  - 1967///
CY  - n.Y
PB  - Holt Rienehart and Winston    
KW  - LINGUISTICS
N1  - pp.19-90
ER  -