Google-forms – Google Form : Allow ONLY one response each day

I think this tutorial will work, it's more of a hack and I'm sure there are cleaner ways to do this, http://www.immersionmedia.com/blog/customizing-and-styling-google-forms/

This tutorial tells you what code to extract from the form. There are other, better ways to do this that involve validating each of your quiz elements (text box, multiple choice etc), but I don't know how to do this. If you find out a better way than my suggestion, please post here.

Hope this helps

Something I have done to accomplish this(sort of) is to make a certain number of identical questions. It could be 5 or 10 or whatever you see the max number being. Then I add a question at the end of each of those that asks if the person would like to add another.

So, in your case, you would have Book 1, Book 2, and Book 3. All are separate sections in the form. The person fills out Book 1 recommendation and says yes to adding another. They get routed to Book 2 section. They only have 2 recommendations so they answer no to adding another. They then get routed to the final section in the form which just contains a submit button.

I wish the ability to just add another question like you are asking for existed but until Google adds something like that, this should get the job done for you.