the same sources through w/h we know that Quran is of superior most authority n then follows Sunnah,speaks f what my previous post described.all the schools of thought of islamic law speak unquivocally to this end.if ur question is about book,refer to the Islamic Law n JUresprudence by Abdur Rahim.that ll clarify ur concept.....
n no situation change the rule.in case quran n sunnah are silent abt something,the next source in hierarchy is Ijmah,n if Ijmah is silent then Qiyas.

regards

__________________
Stop counting your problems rather raise for their solution and BEGIN JIHAD.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Dreams alone makes the life SERENE but SPURIOUS..
Reality alone makes the life STABLE but STAGANANT..
BE A REALIST DREAMER....
-----------------------------------------------
And for how long are we still going to hate ourselves for the only reason that nobody loves us!!!