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Perl 6 Essentials is written by Allison Randal and published by "O'Reilly Media, Inc.". It's available with International Standard Book Number or ISBN identification 0596004990 (ISBN 10) and 9780596004996 (ISBN 13).
Internally, however, there are still kinks and stumbling blocks that developers need to sidestep, long-abandoned features maintained only for backward compatibility, misdirected phrasings that hinder more intuitive syntax structures, and a cacophony of modules that sometimes work well together, but occasionally don't. Perl 5 continues to have a strong following devoted to its development, but in the meantime, a core group of Perl developers has begun work on Perl 6, a complete rewrite of the Perl language. While Perl's creative philosophy and common-sense syntax are sure to remain in Perl 6, everything else in the language is being reexamined and re-created.