It is presented in the patterns format in at least these places:

- Pages 125–143 of Pattern-Oriented Software Architecture (1996) by Buschmann et al. ISBN 978-0471958697.

- Pages 330–332 of Patterns of Enterprise Application Architecture (2003) by Martin Fowler. ISBN 978-0321127426.

I have those books. I can confirm that your citations are correct. That said, Fowler's presentation is brief and doesn't really pass as "pattern form" in my view. POSA has its own slightly different pattern form Context/Problem/Solution/Structure/Dynamics/Implementation/Variants/Known Uses/Consequences:benefits/Consequences:liabilities/Credits(Trygve Reenskaug)