Here is an example, again using Crocheting. If I had an E-Book about Crocheting I might add something like this in the Helpful Resources section:Additional Reading: I highly recommend Kris Perrys Official Guide to Crochet. I found this an invaluable resource as I was getting started learning the basics.See that? Believe it or not, its that easy. I found the product on Clickbank and each time someone buys it through my link, I earn about $25 bucks!When you are doing stuff like this you should really avoid hype at all costs. It is better to sound low key and confident than to scream and seek attention. Make it just another part of your E-Book.Remember, prospects are not stupid. They are actually turning to experts and may already know the things that you know. If you back up your claims with hard facts and data, they would gladly put down hundreds, or even thousands worth of money to act on your recommendations. But if you dont, they are smart enough to try and look at your competitors and what they are offering.Before you add recommendations to you product, it is given that you should try and test the product and support. Do not run the risk of promoting junk products and services. Just think how long it took you to build credibility and trust among your visitors. All that will take to destroy it is one big mistake on your part.If possible, only recommend products that you have 100% confidence in. Test the product before you begin to promote it. This will ensure that the people you are referring will not be left high and dry if a problem should arise.