For current research and about or using children's literature, these databases are great places to start...
Education Source and ERIC - Education research journals and magazines / trade journals for teachers.
MLA International - Literary criticism and literature education journals.
PsycINFO - Psychology and cognitive science journals.
To find historic texts concerning children's literature (reviews, commentary, ads, articles), these databases and collections may be particularly useful...
Early American Imprints
Nineteenth Century Collection Online
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