the correct way to share is to post the link to the source directly, that way you need not credit the original author.
but since you are posting the link to your blog, you should credit the original author if not at least post a source link.
once you post something your website or blog, you "claimed" ownership by left or by right especially if you did not put any credits.
don't you agree?
I know you want more traffic to your blog and it's good to share (i love to share), but share it the right way especially if you are not the original author. Put yourself in the shoes of the original author, how much time and effort he put in to compile this ebook and I don't think he will like it when someone downloaded it and upload to his blog, but only post his blog URL without identifying the source or original author of the book.
What I learn in schools is that, referencing is very important.