Does anyone know where I can find a dictionary of Italian sign language?

I use American Sign Language (the deaf form of communication) as a performing art. I translate songs into ASL and sign along to the music/vocals.
I am working on songs by Josh Groban (the most beautiful, velvet-like voice of all time!) I thought, for accuracy, I would do the Italian songs with Italian signs, but I have been unable to find any books of Italian signs.
I don’t care if the book is in Italian or English, I just need to learn the signs.
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