Here are some scans of original reviews of The Guild of Thieves from 1987.

Computer & Video Games, May 1987

Computer & Video Games featured The Guild on its cover (above) and the following article, written by Keith Campbell.

Commodore User, May 1987

Happy Computer, June 1987

Preview written by Boris Schneider-Johne.

Popular Computing, June 1987

There are more magazine review scans, but for The Pawn here and here.