Frequency

Percent

Valid percent

Valids

Scielo

25

5.2

5.2

Dialnet

3

0.6

0.6

Google Books

228

47.0

47.0

Institutional database

115

23.7

23.7

Redalyc

7

1.4

1.4

Others

93

19.2

19.2

E-lis

2

0.4

0.4

Amazon s3

1

0.2

0.2

Sciencedirect

1

0.2

0.2

Comercio

2

0.4

0.4

Dsia

1

0.2

0.2

Virtual health library publishes universe

1

0.2

0.2

Universo

1

0.2

0.2

Redulac

1

0.2

0.2

Signa

1

0.2

0.2

Cepal

1

0.2

0.2

Redicces

1

0.2

0.2

Researchgate

1

0.2

0.2

Total

485

100.0

100.0