2215-2644
2215-2644
S2215-26442018000200017
10.15517/revedu.v42i2.26473
Ecuador
Ecuador
00
12
2018
00
12
2018
42
2
306
317
[
2017
30
3
3
106-21
]
[
2017
327
]
[
2016
99-109
]
[
2013
]
[
2015
]
[
2012
5
1
1
5-11
]
[
2013
6
12
12
1-14
]
[
2005
21
1
1
103-12
]
[
1988
78
7
7
674-81
]
[
2011
]
[
1986
]
[
2010
2
4087-91
]
[
1979
]
[
2007
]
[
2012
5
10
10
]
[
2018
31
47-68
]
[
2012
5
9
9
71-84
]
[
2006
]
[
2011
13
1
1
43-55
]