bibliographical info

[EAJUAN%EBRUPC51.BITNET at cunyvm.cuny.edu]

Please, can somebody give me references of :

  1) good UNIX introductory books

  2) good UNIX reference manuals (for advanced users) (tackling subjects
     as indexed file organization, ...)

  3) good "C under UNIX" books (tackling subjects as communication between
     concurrent processes, ...)

Thanks in advance !