Most online public domain versions of Shakespeare's texts are based on the Globe Edition of 1866, the Gutenberg Edition, or the MIT/Moby Edition (a revised version of the Globe Edition). There are many inconsistencies and errors in these editions so they are considered less-authoritative and poor for study. Alternatively, there are several quality editions of Shakespeare's works like the Riverside, Arden, and Bevington editions, which aren't free but come with a strong scholarly backing.