I second your recommendation. This is the best book on the market for GLOCK owners to have IMHO!Old-Fashioned,
If your username is accurate, you may like to have printed material to work from rather than a web site. If so, I recommend that you get the Patooma The Complete Glock® Reference Guide.
It's available here: The Complete Glock Reference Guide, Shooting Supplies, Lonewolf at Sportsman's Guide and probabely elsewhere as well.