Ladd, Gary W.; Herald, Sarah L.; Kochel, Karen P. (2006-01-03). "School Readiness: Are There Social Prerequisites?". Early Education and Development. 17 (1): 115–150. doi:10.1207/s15566935eed1701_6. ISSN1040-9289. S2CID144934219.
Ladd, Gary W.; Herald, Sarah L.; Kochel, Karen P. (2006-01-03). "School Readiness: Are There Social Prerequisites?". Early Education and Development. 17 (1): 115–150. doi:10.1207/s15566935eed1701_6. ISSN1040-9289. S2CID144934219.
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Michel, Boivin; L., Bierman, Karen (2014-01-01). Promoting school readiness and early learning : implications of developmental research for practice. The Guilford Press. ISBN9781462511457. OCLC874774990.{{cite book}}: CS1 maint: multiple names: authors list (link)
Ladd, Gary W.; Herald, Sarah L.; Kochel, Karen P. (2006-01-03). "School Readiness: Are There Social Prerequisites?". Early Education and Development. 17 (1): 115–150. doi:10.1207/s15566935eed1701_6. ISSN1040-9289. S2CID144934219.