Herrera Vargas, L. (2012). Main causes of dropout student and applied techniques for prevention from managing in the Night School of the Union and the National School Virtual Marco Tulio Salazar headquarters in the canton of La Union.

Herrera Vargas, Leonardo. Main Causes of Dropout Student and Applied Techniques for Prevention From Managing in the Night School of the Union and the National School Virtual Marco Tulio Salazar Headquarters in the Canton of La Union. 2012.

Herrera Vargas, Leonardo. Main Causes of Dropout Student and Applied Techniques for Prevention From Managing in the Night School of the Union and the National School Virtual Marco Tulio Salazar Headquarters in the Canton of La Union. 2012.