A couple of excellent texts for immunochemistry are:
Immunohistology in Diagnostic Pathology ed by J.C. Jennette
CRC press 1989
Immunomicroscopy: A Diagnostic Tool for the Surgical Pathologist
eds. C.R. Taylor and R.J. Cote
W.B. Saunders and Co. 1994 (2nd edition)
I have found these texts along with Polaks and Van Noordens latest
Immunocytochemistry to cover most aspects of immunohistochemistry.
Regards
BJC - Brian