All the online sites like amazon, apple, kobo etc can download the first 10% of any ebook as a sample so you can try-before-you-buy
* If the links aren't there, add it now! Even better, add one in the side bar and others at the bottom of the article.
* It the links are somewhere in the page: Add a more visible copy (or two) for people like me that can't find them.
If someone was interested enough to read your post, they may want to take a look. Make it easy.
or here => https://books2read.com/b/b6qlWE
Anyway, my recommendation is to add an explicit section of the RHS that says "Books" with a link to each book. Bonus points for an image of the cover of each book.