Do you have the book 'How to Win Friends and Influence People' by Dale Carnegie in the Finnish language? Even better, do you have this as an äänikirja in the Finnish language?
In Finnish, the title is "Miten saan ystäviä, menestystä, vaikutusvaltaa". In HelMet libraries there are several editions of the book. You can check their availability in HelMet Web Library:
Unfortunately, the book does not seem to exist as an audio book.