My goto reference sources would be: For turbo's (in preferential order) "Forced Induction Performance Tuning" by A. Graham Bell, "Maximum Boost" by Corky Bell, a nod to "Turbocharging Performance Handbook" by Jeff Hartman and then anything I can get my hands on. For EFI, I like "Fuel Injection Sysems" and "Engine Management" both by Greg Banish, "How To Tune and Modify Fuel Injection Systems" by Jeff Hartman, and then anything I can get my hands on.
Now if only I could apply everything I have read...