The original books might be useful if you're thinking of running Blood Sword as a DW roleplaying campaign. You can get those here:
In the US
In the UK
Italian gamers won't need to use Dragon Warriors as all the work has been done for you by Valentino Sergi and Daniele Fusetto in their magnificent Blood Sword 5e book, published by Tambù. It turns the whole gamebook saga into a Dungeons & Dragons campaign, and it truly is a thing of beauty.
And if you aren't familiar with the Blood Sword series and you're looking for a taster, Raphael Perry did a playthrough of book 1 on YouTube along with this very interesting strategy analysis: