http://www.youtube.com/watch?v=tji3TLkqmrc
http://www.youtube.com/watch?v=nD6vQBXiG7I&list=PLF08DC4D2E24D7926&index=14&f eature=plpp_video
2
http://www.passivehouse-international.org/index.php?page_id=288
http://www.passivehouse-international.org/index.php?page_id=299
3
http://www.passivehousebg.com/index.php?option=com_content&view=article&id=9&Ite mid=127&lang=bg PHPP
http://www.passivehousebg.com/index.php?option=com_content&view=article&id=11&Ite mid=130&lang=bg
http://passive.bg/bg/conception/25-conception.html
ñíèìêà: Andrea Johnson, 2010
http://passive.bg/bg/conception/23conception.html
http://www.facebook.com/pages/IG-Passive-House-Bulgaria/170574069647336 http://www.facebook.com/groups/109564129107765/?ref=ts&fref=ts