http://betaproiect.ro/betaproiect-nou/index.php?option=com_content&view=article&id=74:proiectare-constructii-civile-case-8&catid=41&Itemid=91#sigProId8bb3b8b70c
http://betaproiect.ro/betaproiect-nou/index.php?option=com_content&view=article&id=74:proiectare-constructii-civile-case-8&catid=41&Itemid=91#sigProId8e2c66fdf0