I have borderline personality disorder myself, and I have read so much about ASPD, but never really any NPD stuff
Ive always wanted to read Why Does He Do That? but i am not sure if its really related to NPD, but this one looks intriguing: http://www.amazon.com/Stop-Spinning-Start-Breathing-Narcissist/dp/1495253074/ref=pd_sim_14_25?ie=UTF8&refRID=0EZC55EXANP06BZ9P4GR
edit: even if its not any good, its freaking FREE with amazon prime, and i mean the physical copy, HELL YEAH!