http://www.geira.pt/pnpg/trilhos.html
http://www.serra-do-geres.com/ja_estive_aqui_ficheiros/geira_romana/geira.htm
http://trilhos.wordpress.com/category/geres/
http://descobrindoportugal.blogspot.com/2006/08/gers.html
http://www.serradogeres.com/index.php?option=com_content&task=view&id=17&Itemid=31
http://www.walkinportugal.com/index.php?option=com_content&view=article&id=121&lang=pt