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If you have a nice landing page that highlights the content and benefits of the White Paper, people will have no problem linking to the page with a form on it. Be sure you are giving your outreach targets a copy of the Whitepaper without making them have to download it. Make it as easy as possible for them to check out your content and decide if it's something they want to recommend. I would recommend you try to make them feel special. Tell them it's brand new and you want to give them a sneak peak. Ask them for feedback on your whitepaper. After you get their feedback, you've got them invested enough in your content that you can request that they share it or link to it.