Wang, Pei-JungLiao, Hua-FangMorgan, George A.2018-01-282018-01-282017-072064-2199http://hdl.handle.net/2437/247623motivationyoung childrendevelopmental delayindividualized mastery tasksmoderately challengingpersistencetask pleasureThe Revised Individualized Moderately Challenging Mastery Tasks for 15- to 48-month-old Childrenfolyóiratcikkopen access journalDebreceni Egyetemi KiadóHungarian Educational Research Journal22017Wang, Pei-Jung,Liao, Hua-Fang,Morgan, George A.2018-01-30Thematic Articles0000-0003-2978-3988; Morgan, George A.