Submitted on: 22 January 2018.
Revised on: 28 February 2018.
Accepted on: 26 March 2018.
NULL
http://reply.papertrans.cn/3/271/27077/27077-22.png
Submitted on: 05 June 2004.
Revised on: 19 July 2004.
Accepted on: 02 August 2004.
Revista Peruana de Investigacion Educativa
http://reply.papertrans.cn/3/271/27077/27077-24.png
http://reply.papertrans.cn/3/271/27077/27077-25.png
http://reply.papertrans.cn/3/271/27077/27077-26.png
Submitted on: 14 April 1999.
Revised on: 28 May 1999.
Accepted on: 10 June 1999.
NULL
http://reply.papertrans.cn/3/271/27077/27077-28.png
Submitted on: 18 January 2007.
Revised on: 06 February 2007.
Accepted on: 11 February 2007.
NULL
Submitted on: 30 December 2021.
Revised on: 19 January 2022.
Accepted on: 14 February 2022.
NULL