Xu D, Yapanel U, Gray S, Baer CT. The LENA™ Language Environment Analysis System: the interpretive time segments (ITS) file. LENA Foundation Technical Report No. LTR-04–2. 2008; Available at: https://www.lenafoundation.org/wp-content/uploads/2014/10/LTR-04-2_ITS_File.pdf . Accessed March 18, 2016
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