How to add a third party link to my Shopify account for customers to complete purchase

1 0 0

I would like to add a third party link to a product that acts as a buy now or add to cart button. I need this because I am selling ebooks and printed books on my Shopify store but I'm only able to sell ebooks because I do not have the capability to sell both due to an inventory and storage facility deficiency. I decided to allow Amazon to handle the printed books transactions and I have a link to my Amazon bookshelf to share on Shopify. Otherwise I will have to market Amazon in my product commercials instead of Shopify. Please help ASAP.