Cooper, H.; Charlton, K.; Valentine, J. C.; Muhlenbruck, L. (2000). «Making the most of summer school: a meta-analytic and narrative review». Monographs of the Society for Research in Child Development. 65 (1): i-v, 1–118; discussion 119–27. PMID12467098. doi:10.1111/1540-5834.00059.
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Cooper, H.; Charlton, K.; Valentine, J. C.; Muhlenbruck, L. (2000). «Making the most of summer school: a meta-analytic and narrative review». Monographs of the Society for Research in Child Development. 65 (1): i-v, 1–118; discussion 119–27. PMID12467098. doi:10.1111/1540-5834.00059.