Reddit mentions of The Sagas of Ragnar Lodbrok

The Sagas of Ragnar Lodbrok Amazon and Audible

This volume presents new and original translations of the three major Old Norse texts that tell Ragnar's story: the Saga of Ragnar Lodbrok, the Tale of Ragnar's Sons, and the Sögubrot. Ragnar's death song, the Krákumál, and a Latin fragment called the List of Swedish Kings, complete the story.

http://www.amazon.com/The-Sagas-Ragnar-Lodbrok-Waggoner/dp/0578021382

When I started watching this show a few years ago I ended up buying quite a few books about Norse Mythology and Asatru (the reconstruction religion that is becoming more popular).

Here are a few good ones

The Norse Myths This is a good basic breakdown of the stories in the Sagas/Eddas and is easy to read.

Viking Age: Everyday Life During the Extraordinary Era of the Norsemen This is a fantastic book that really isn't related to the myths (there is a religion section) but this is a great book that goes over the everyday lives of Vikings and their families. Everything from political structure down to what they ate and how they dressed. It also has great illustrations.

The Prose Edda: Norse Mythology (Penguin Classics) - one of the source materials of the myths.

The Sagas of Ragnar Lodbrok - I dont have this one personally but it is on my list to buy.

If you want to read about the reconstruction religion that has gained in popularity since the 70s check this book out. Essential Asatru: Walking the Path of Norse Paganism - This is another easy to read book that not only goes over the basics of the Myths/Gods but also goes over the ceremonies and rituals of those who choose to practice today what the Vikings practiced. Minus the live sacrifices... those have been replaced with food and drink thankfully.

If you are just wanting to dip your toes into learning about the myths I cannot recommend the first link more than enough. It is far easier to read than the Eddas/Sagas and from what I understand from other subs is a widely regarded starting point.

Also check out /r/norse and /r/asatru.

There's The Sagas of Ragnar Lodbrok. Now remember some historians believe Ragnar to be a conglomeration of many Viking heroes, even though the Vikings who are named his sons were real.

There's also this about Ragnar's sons.