hi amindzo,
I assume you want to write assembler code for PIC's?
If so, the datasheets will have the instruction set for the PIC you want to write the code for.
Also in the datasheet there are many examples of code fragments. This forum has many excellent tutorial sites to chose from.
I find that books for assembler coding are so general and wide reaching in their coverage that they are virtually useless!. IMO.
You will learn much more and at a faster rate, if you use tutorials.... [look at Nigel's site]
I hope I am not misunderstanding your original enquiry.
Regards