The Inrernational Encyclopedia of Education：Research and Studies．volume 7，P-R The International Encyclopedia of Education：Research and Studies．volume 6，M-O The International Encyclopedia of Education：Research and Studies．volume 8，S The International Encyclopedia of Education：Research and Studies．Volume 4 F-H The International Encyclopedia of Education：Research and Studies．Volumn 2，C Internatinal Encyclopedia of Education：Research and Studies．Volume 4，F-H Internatinal Encyclopedia of Education：Research and Studies．Volume 9，T-Z The International Encyclopedia of Education：Research and Studies．Vol. 7 The International Encyclopedia of Education：Research and Studies．Vol. 1 The International Encyclopedia of Education：Research and Studies．Vol. 10