In reply to AJM:
The blog that you linked mentions two guidebooks:
- Escalada en Los Mallos de Riglos
- Riglos Vertical
Last year before a trip to Riglos I checked this and Riglos Verical was the newest, just released one.
It also contains descriptions in English.
I have used it and liked it, although there is a possible inaccuracy in the topo of one of the classic routes we did (missing pitch on Pany-Haus)