[Moved]All digital phase locked loop books?

[oucd]

Hi,
I have some experience with digital pll. However, I am completely new all digital pll. I am looking for a practical design book on all digital pll. Any recommendation?

 

[Debdut]

Why hasn't anyone answered to this post. I, too, need some good books on PLL. I have heard about Gardner's book and Roland Best's book but those are either unavailable in my region or are very costly.
Please recommend some books on PLL.