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Hamilton, Mykol C.; Anderson, David; Broaddus, Michelle; Young, Kate (December 2006). "Gender stereotyping and under-representation of female characters in 200 popular children's picture books: a twenty-first century update". Sex Roles. 55 (11–12): 757–765. doi:10.1007/s11199-006-9128-6. S2CID146234748.