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Hallinger, P., Gümüş, S., & Bellibaş, M. Ş. (2020). “Are principals instructional leaders yet?” A science map of the knowledge base on instructional leadership, 1940–2018. Scientometrics. doi:10.1007/s11192-020-03360-5 
10.1007/s11192-020-03360-5
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