004180000a22001690004500650002300000650002300023650002400046082001800070530000600088100002900094100002500123245003800148260003000186260000900216041000800225300001500233  aLibrary management  aReference services  aInformation science  a025.52bC349f  aM  aChakrabarti, Bhubaneswar  aSengupta, Benoyendra  aFundamentals of reference service  aCalcuttabThe World Press  c1985  aEng  axix, 248p.