All SEO experts emphasizes on Link diversity of a website to get better ranks in Google and other search engines. It is an indicator for good Off Page SEO and it means your website should have backlinks from different type of sources likes articles, product submissions, ebooks, presentation, videos, social bookmarks, ad posts, question/answers, forum/blog commenting, link directories etc.
Focusing on only one backlink source is not beneficial and you have to take on all the backlinks with the same pace. Just as an example, your product should have backlinks from all these sources on daily basis.
After my last article about product submission sites, this time I have came with presentation, Ebooks and PDF submission sites which are of course a big source of backlinks.
List of Presentation and PDF Submission Sites
So here is the list of Presentation and PDF Submission Sites;
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