000			00304nam a2200133Ia 4500
008			241129s9999 xx 000 0 und d
100			_aStallings,William
245		0	_aData and computer communications
250			_a-
260			_bPearson Education
260			_c2007
300			_a834
942			_cBK
999			_c21746 _d21746