Hess, F. M. (2010). Education unbound: The promise and practice of greenfield schooling. ASCD.
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Chicago-čujuhus (17. p.)
Hess, Frederick M. Education Unbound: The Promise and Practice of Greenfield Schooling. Alexandria, VA: ASCD, 2010.
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MLA-čujuhus (9. p.)
Hess, Frederick M. Education Unbound: The Promise and Practice of Greenfield Schooling. ASCD, 2010.
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