NIM:C51208031. Bibliografi hlm. 77-79.
NIM:088613994.
NIM:C01206063. Bibliografi hlm. 99-102.
NIM:088900035.
Bibliografi hlm. 113-118.
Bibliografi hlm. 287-301.
Judul asli:Higher Learning in Islam: the Classical Period, A.D. 700-1.300.
Bibliografi: hlm. 133.