TY  - BOOK
AU  - Bartsch,Renate
TI  - Norms of language: theoretical and practical aspects 
T2  - Longman linguistics library
SN  - 0582004195
U1  - 410 Abridged edition 15
PY  - 1987///
CY  - London
PB  - Longman
KW  - Standard language
KW  - Linguistic change
KW  - Language planning
ER  -