Best book on SAP SD Taxes & Pricing

Hi Friends,

Why I mentioned taxes first is because I am from non-commerce background & have weak knowledge of Finance & taxes. Also I am a little slow learner as I am not a native English speaker & I am at the beginning stage of SAP SD learning process. I have already Glyn C. Williams Pricing chapter as well as Kapil Sharma & A. Mutsuddi book on SAP SD & created 2 condition tables with the help of these books. But still many concepts are not clear from Glyn's book as it is written in a little difficult language & presentation is very complex. So I want master the concepts on SAP Pricing as well as related Taxes so that later I face no problem on any part related to these.

   Based on my background  ,I did some research & zeroed in to these 2 books -

1)Effective Pricing with SAP ERP by D. Rajen Iyer(Author), S. Veeraraghavan(Author) 

2)The Ultimate SAP Pricing Guide: How to Use SAP's Condition Technique in Pricing, Free Goods, Rebates and Much More by Matthias Liebich (Author)

Out of the above, which one will be better for mastering of the subject(including Taxes in Indian & International context) in terms of SAP SD ?

Will be greatly obliged if someone helps me in choosing.

Thanks & Regards