000			00642nam a2200241Ia 4500
001			55927
005			20250221155947.0
008			250214s9999||||xx |||||||||||||| ||und||
020			_a9788120346390
100			_aGurdev Singh
245		0	_aInformation sources, services and systems
260			_aDelhi
260			_bPHI Learning
260			_c2013
300			_axviii, 517p.
500			_aIncludes bibliographical references and index
650			_aE-sources
650			_aInformation services and systems
650			_aInformation sources
650			_aReady reference sources
650			_aReference services
942			_cBK
999			_c71697 _d71697