Brill's first encyclopaedia of Islam, 1913-1936" in 1987* Ryan-Ranson, Helen (1993) "Imagination, Emblems and Expressions", Popular Press, ISBN 0-87972-581-8, M1 Google Print* Wasserstein, David J.
Ein historisch-politisches Nachschlagewerk", Artemis Verlag* Ryan-Ranson, Helen (1993) "Imagination, Emblems and Expressions", Popular Press, ISBN 0-87972-581-8, M1 Google Print* Wasserstein, David J.