TY - BOOK ID - 137998033 TI - Language acquisition : the age factor. AU - Singleton, David Michael AU - Ryan, Lisa PY - 2004 PB - Clevedon Multilingual Matters DB - UniCat KW - #A9208OVM UR - https://www.unicat.be/uniCat?func=search&query=sysid:137998033 AB - ER -