Authentic Catholic Novenas

I have been searching for a few novenas on the internet, and I find different ones for the same Saint. How do I know if that is the real one, is there a link about which Novenas are the real ones. Maybe the Holy See has some information on this? I would also like to buy a booklet from Amazon, but how do I know these are the real prayers?

Appreciate your help.

Look for an imprimatur, or “with ecclesiastical approbation”.

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