http://reply.papertrans.cn/3/201/20021/20021-21.png
Submitted on: 04 September 2013.
Revised on: 12 October 2013.
Accepted on: 25 October 2013.
Journal of Unschooling and Alternative Learning
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Submitted on: 25 October 2019.
Revised on: 13 November 2019.
Accepted on: 01 December 2019.
NULL
Submitted on: 02 July 2011.
Revised on: 30 July 2011.
Accepted on: 12 August 2011.
Journal of Unschooling and Alternative Learning
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