I enjoyed
Rendezvous with Rama by Arthur C. Clarke last year. It won both the Hugo and Nebula awards when it was published (1973?). Excellent read.
I also read
Blindsight by Peter Watts which also talks about a first contact and was Hugo nominated/Locus Award winning. Blindsight is available
free on his website* through a Creative Commons license.
Neither book really get into integration, but are interesting nonetheless.
*His website is blocked where I am at, so I hope that link is correct.