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平台:
DOAJ Directory of Open Access Journals
(Available from 2011.)
EBSCOhost MLA International Bibliography
(Available from 2014/03/01.)
ProQuest Literature Online
(Available from 2013/04/01. Most recent 1 year(s) not available.)
ProQuest Literature Online
(Available from 2009/10/01 until 2012/10/31.)