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Journal Article Defining the Zone of Proximal Development in US Foreign Language Education Get access Celeste Kinginger Celeste Kinginger Search for other works by this author on: Oxford Academic Google Scholar Applied Linguistics, Volume 23, Issue 2, June 2002, Pages 240–261, https://doi.org/10.1093/applin/23.2.240 Published: 01 June 2002
Celeste Kinginger (Sat,) studied this question.