@ Abdul Rahim Chaudhry : You must not narrate your methodology as a final and absolute reality. D.F Mullah and Sir Abdur Rahim are inevitable for preparing Muhammadan law. Moreover the key-books you mentioned are quite low in substance and lack the basic logic of the subject. For instance no key book has explained the principles of inheritance as good and simple as mullah has done.
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@ samra kanwal: In my perception you must go through the book of MULLAH. If you feel any difficulty in comprehending the substance try some summarized version of Mullah 's book.

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“You were born with wings. Why prefer to crawl through life?”