Tex Texin wrote:

> On Urdu, one of my sources considered Urdu a separate
> script. I am trying to find which one.

That could be Akira Nakanishi's "Writing Systems of the World", a book which
describes writing systems used in today's (well, late 70's) daily
newspapers.

Nakanishi treats Urdu as a separate "alphabet" from Arabic, probably because
it is (was?) not customary to typeset Urdu: all text on Urdu newspapers is
(was?) handwritten by a calligrapher. OTHO, Arabic and Persian newspapers
are normally typeset and calligraphy, if any, is only used for the titles.

_ Marco