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APA Citation
Lösch, T., Kelava, A., Nagengast, B., Trautwein, U., & Lüdtke, O. (n.d.). perspective matters: The internal/external frame of reference model for self- and peer ratings of achievement. Learning and instruction, 52, 80–89. http://access.bl.uk/ark:/81055/vdc_100050160133.0x000005