1990-8644
1990-8644
S1990-86442019000400218
Ecuador
Ecuador
00
12
2019
00
12
2019
15
69
218
223
[
2009
]
[
1976
]
[
2002
]
[
1983
]
[
1982
]
[
2018
15
1
1
77-91
]
[
2018
109-20
]
[
2003
]
[
2005
13
89-112
]
[
2012
25
]
[
1997
]
[
2015
]
[
México. Secretaría Educación Pública
2009
]
[
2004
]
[
2015
6
2
2
31-45
]
[
2002
]
[
1985
372-419
]
[
1995
]