Political Science and Constituional Law books
 

I have opted for constitutional law as well as Political Science. Yesterday I went about looking for all the Political Science and constitutional law books recommended by CSPs here on CSS forums. Following were the books which I was able to find:

[B]1. Political Science: Theory and Practice by Mazhar ul Haq

2. Political Thought from Plato to Present by Judd Harmon

3. Muslim Political Thought (Safes of The Ages) by M. Aslam Chaudhry

4. Political Thought in Medieval Islam by Rosenthal

5. How states are governed by Sohail Bhatti and Aslam Chaudhry

6. World Constitutions by Keeley as edited by Sohail Bhatti.[/B]


I was also able to find [B]'Select Modern Governments' by 'VD Mahajan'[/B] but wasn't sure whether I need so many books. Should I buy it?
Also 1 book which I wasn't able to find but which I think I should have is [B]'A study in constitution of Pakistan' by 'Dr. Safdar Mehmood'[/B]. So do I really need it? And is there some other book which I can use as a replacement for this one. Lastly, do the above mentioned books which I bought cover the syllabus of their respective portions?