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Clark, Roger; Jessica Guilmain; Paul Khalil Saucier; Jocelyn Tavarez (November 2003). "Two Steps Forward, One Step Back: The Presence of Female Characters and Gender Stereotyping in Award-Winning Picture Books Between the 1930s and the 1960s". Sex Roles. 49 (9): 439–449. doi:10.1023/A:1025820404277. S2CID141411258.