Daily Trust, Yar'Adua Interview, 3rd of March 2007 "Celebration Galore as Yaradua is Installed Mutawallen Katsina".
Ngày 6 tháng 5 năm 2010.  ^ Daily Trust, Yar'Adua Interview, 3rd of March 2007 ^ “Celebration Galore as Yaradua is Installed Mutawallen Katsina”.