Hi Orpio
I'm afraid I can't point you at any other websites, and I only know of one book which has a substantial section on the Yaudheyas, which could be available to you somewhere:
Sharan, M.K., 'Tribal Coins: A Study', 1972 (Chapter 2, pp.65-147 is on the Yaudheyas)
Also,
Mitchiner, M., 'Oriental coins and their values: Ancient and Classical World' illustrates several different
types.
Most other references I've seen have just been short chapters in books or papers in journals.
Best wishes
Alan