Second April's Review - "The appeal of playing Zork II lies less in the puzzles than in the game environment." - http://members.cox.net/dns361/zork2.html
Infocom Documentation Project - PDF file of scanned original game manual. - http://infodoc.plover.net/manuals/zork2.pdf
David Tanguay's Review - Rated +0 on -5 to +5 scale. "There's fun to be had, but you must be careful to save often. This is a game for serious adventurers only." - http://www.sentex.net/~datanguayh/games/zork02_rev.html
Infocom Games: Zork II - Game information, box photos and blurb, specifications, release information, and sample transcript from manual. - http://www.infocom-if.org/games/zork2/zork2.html
Adventure Collective Review - Rated 5/5. "As with all the early games in the Zork series, Zork II has to be a must for any traditional adventure fan." By Karen Tyers - http://www.adventurecollective.com/reviews/zorkii.htm