Renaisance / John R. Hale

 Hale, John R.;

Nederland : Time Life International , 1975

Age of exploration / John R. Hale

 Hale, John R.;

Nederland : Time Life International , 1974

Abu Ya'qub al-Sijistani : Intellectual Missionary / Paul E.Walker

 Walker, Paul E.;

London : I.B.Tauris , 1996