000			00497nam a22001571 4500
020			_a0521387957
041			_aeng
082			_a418.007 _bD489
100			_aHarley, Birgit
245			_aThe development of second language proficiency
260			_aCambridge _aNew York _bLongman _c1990
300			_a248 p. _c24 cm.
500			_a004695 _aL 363
650			_aLanguage and languages _xStudy and teaching _xCongresses _xSecond language acquisition _xCongresses _xBilingualism _xCongresses
942			_cBOOK
999			_c25492 _d25492