I`m doing in situ hybridisation with RNA probes and perhaps I can help
you. I have found two books and can recommend two journals two you.
The books are:
1) "in situ HYBRIDIZATION HISTOCHEMISTRY"
from Marie-Francoise Chesselt, CRC press
2) "In situ Hybridization"
A practical approach
edited by D.G. Wilkinson, IRL press
I have got many informations about in situ from the two advertising
journals from Boehringer Mannheim:
1) The DIG System User`s Guide for filter hybridization
2) Nonradioactive In situ Hybridization
I hope I could serve you with the information