Opinion on Books

While searching on net I have come across these books which are available almost at every retailer. If any user has used these books, pass there opinion please.

1) Programming & Interfacing the 8051 Microcontroller in C & Assembly
Written by Helen Emery Sencer Yeralan

2) Microcontroller Projects in C for the 8051 Family
Dogan Ibrahim

3) C & The 8051
Written by Thomas Schultz

Your help would be much appreciated

Regards
Umar

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