Wowhead User Patrickjarvis324 completed this as an Alliance player and detailed the recommended books to acquire 20. Now that players can reach level 30, some of these will likely be much easier to obtain.
Book Collection Ring No Longer Class Restricted in WoW: Forever
Throughout the world in World of Warcraft: Forever, players can collect various books that allow them to unlock new quests. At 20 books, you unlock the quest Greater Friend of the Library, which grants the player one of two rings, including Field Researcher's Loop. This item was previously a Rogue-only ring, but it has since been changed and is now available to all classes.
