Research on textbook gender bias

Textbooks may not include enough female characters or too often may portray women in submissive gender roles, according to data released by UNESCO. The data, released to celebrate International Women's Day, revealed that women are underrepresented in textbooks and curricula, researchers noted.
Benavot, A., & Jere, C. (2016). Gender bias is rife in textbooks. World Education Blog (March 8).
https://gemreportunesco.wordpress.com/2016/03/08/gender-bias-is-rife-in-textbooks/