Submitted on: 15 October 2013.
Revised on: 30 October 2013.
Accepted on: 14 November 2013.
Revista Espanola de Pedagogia
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Submitted on: 22 May 2003.
Revised on: 08 June 2003.
Accepted on: 19 June 2003.
Revista Espanola de Pedagogia---UNIV INT RIOJA-UNIR
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Submitted on: 12 August 2010.
Revised on: 22 September 2010.
Accepted on: 07 October 2010.
Revista Espanola de Pedagogia---UNIV INT RIOJA-UNIR
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http://reply.papertrans.cn/3/270/26944/26944-27.png
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Submitted on: 05 January 2018.
Revised on: 26 January 2018.
Accepted on: 06 February 2018.
Revista Espanola de Pedagogia
Submitted on: 06 January 2013.
Revised on: 16 February 2013.
Accepted on: 28 February 2013.
Revista Espanola de Pedagogia