Random thing regarding linking to books: after I noticed you link to Amazon Italy, I thought I might suggest bookshop.org, which is vendor-neutral (i.e. not Amazon) and as far as I can tell region-neutral, as well. [EDIT: it’s currently US and UK only, oh well.]
(I couldn’t find the Regina Sharif book on bookshop.org, but I thought I’d mention the website regardless. I’m not sure why some books are indexed on it and others are not, though it may be possible to get them to add missing books, idk.)
Random thing regarding linking to books: after I noticed you link to Amazon Italy, I thought I might suggest bookshop.org, which is vendor-neutral (i.e. not Amazon) and as far as I can tell region-neutral, as well. [EDIT: it’s currently US and UK only, oh well.]
(I couldn’t find the Regina Sharif book on bookshop.org, but I thought I’d mention the website regardless. I’m not sure why some books are indexed on it and others are not, though it may be possible to get them to add missing books, idk.)
[EDIT: it looks like bookshop.org uses Ingram Spark as their backend database: https://support.bookshop.org/en/support/solutions/articles/65000180944-how-can-i-list-my-book-on-bookshop-org- ]