000 00286 a2200121 4500
020 _a978-81-203-4639-0
100 _aGURDEV SINGH
245 _aINFORMATION SOURCES, SERVICES AND SYSTEMS
250 _aNA
260 _bPHI LEARNING PRIVATE LIMITED
_c2013
440 _aNA
490 _aNA
999 _c301302
_d301302