Microprocessor Architecture Programming

For the guys like me "struggling" with Microprocessor Architecture programming ....i did some research and found a PDF in the OS Lab ...  Guide_to_Assembly_Language_Programming_in_Linux_2005
The link is given below ..
http://www.cin.ufpe.br/~lgr2/Guide_to_Assembly_Language_Programming_in_Linux_(Springer-2005).pdf

and also the "NASM"(Netwide Assembler) Manual

https://docs.google.com/file/d/0B3int2YK7n1HY1BqOUY1aWttVWc/edit?usp=sharing