You've asked me this question privately by email already, so I'll post here the links that I gave you, in the hope that it might also help others.
This is a good state of the art: Sequence Assembly Demystified, http://www.nature.com/nrg/journal/v14/n3/full/nrg3367.html
I don't know of many books. This recent one seems to give a quick overview: http://link.springer.com/book/10.1007/978-1-4939-0715-1
I'll add this thread: Genome Assembly Review Papers