00249nam a2200097 a 450000500170000008200130001710000200003024500380005026000330008830000300012120251203110710.0  a410bTHI  aThirumalai,M.S.  aLearning theories and linguistics  aMadrasbTamil Nuulagamc1977  a138ப.c20செ.மீ.