The International Encyclopedia of Education：Research and Studies．volume 8，S The International Encyclopedia of Education：Research and Studies．volume 6，M-O The International Encyclopedia of Education：Research and Studies．Volumn 2，C The Inrernational Encyclopedia of Education：Research and Studies．volume 7，P-R The International Encyclopedia of Education：Research and Studies．Volume 4 F-H The International Encyclopedia of Education：Research and Studies．Vol. 8 The International Encyclopedia of Education：Research and Studies．Vol. 1 The International Encyclopedia of Education：Research and Studies．Vol. 10 The International Encyclopedia of Education：Research and Studies．Vol. 2 The International Encyclopedia of Education：Research and Studies．Vol. 5