Chapter: 4 Effects of Bilingualism and Bilingual Education on Oral and Written English Skills: A Multifactor Study of Standardized Test Outcomes

By A. Lewis, B. Pearson, R. Eilers, Vivian C. Umbel. 2002

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Lexical acquisition over time in minority first language children learning English as a second language (2008, methodology): “As mentioned above, Cobo-Lewis et al. (2002) looked at two key sources of individual variation affecting L2 lexical acquisition: amount of exposure to English in the home and SES.”
The role of age of onset and input in early child bilingualism in Greek and Dutch (2011, background): “In a study with the same children, Cobo-Lewis et al. (2002a, 2002b) observed that the vocabulary acquisition is also subject to input effects, in both the minority and majority language (see also Scheele, Leseman, & Mayo, 2010).”
Second Language Acquisition in Childhood (2008, background): “The Miami studies reported above on vocabulary and grammatical acquisition found that low SES children performed worse than high SES children on the oral language measures from second grade to fifth grade (Cobo-Lewis et al., 2002; Eilers et al., 2006; Gathercole, 2002a, 2002b). Hakuta et al. (2000) ”
Bilingual first-language development: Dominant language takeover, threatened minority language take-up* (2009, background): “Cobo-Lewis et al. (2002b) report that on the English PPVT, the monolingual English children had an overall 14.9 point advantage on standard scores over the bilinguals.”