27. Goddard, Roger D., and Yvonne L. Goddard. "A multilevel analysis of the relationship between teacher and collective efficacy in urban schools." Teaching and Teacher Education 17, no. 7 (2001): 807-818.; Goddard, Roger D., Wayne K. Hoy, and Anita Woolfolk Hoy. "Collective teacher efficacy: Its meaning, measure, and impact on student achievement." American educational research journal 37, no. 2 (2000): 479-507.

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