More information for Sarah Sammi:

St. Nicholas is (or was) a periodical, not a book. St. Nicholas was the oldest source I could find, but the poem was also printed in several later books. To see a list of them, follow this link to a Google Books search results page.

Then, to see the actual text (if available) click on a book title.

Next, click on "About this book."

Next, click on "Find in a Library." This will take you to a different web site called WorldCat.org. Find the box called "Enter your location" and type in your Zip Code (if you are in the US) or your postal code (if you are in the UK or Canada—I don't know about other countries; maybe you would need your country name). Then click "Find Libraries." It will show you a list of libraries near you where the book can be found.

Does that answer your question?

I am away from home right now and might not be able to answer further questions for a couple of days. If you get stuck, you might try printing out a relevant page and taking it to a local library to see if the librarian can help you. I think most librarians are familiar with WorldCat.org and probably Google Books.