2550-6722 2550-6722 S2550-67222018000300067 Ecuador 00 04 2018 00 04 2018 4 67 77

2004 2009 1977 1997 1970 1992 2017 2 23-34 2016 2013 Argentina 2006 Programa Educativo Visual 1994 2011 2017 2009 291-306 2010 Argentina 2005 2002