AUTHOR=Wagner Laura TITLE=By the numbers: a quantitative content analysis of children's picturebooks JOURNAL=Frontiers in Psychology VOLUME=4 YEAR=2013 URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2013.00850 DOI=10.3389/fpsyg.2013.00850 ISSN=1664-1078