Butt, Amjad Mahmood The Constitution Of The Islamic Republic Of Pakistan : As Amended By The Constitution ( Twentieth Amendment ) Act, 2012 - 1st ed. - Karachi : Pakistan Law House , 2013 . ISBN: 978969837208 LCCN: KPL1744 Subjects--Topical Terms: Constitutions--PakistanConstitutional law--Pakistan LC Class. No.: KPL1744