1. The Effect of Peer Socioeconomic Status on Student Achievement: A Meta-Analysis Autoren: van Ewijk, Reyn; Sleegers, Peter Typ: Zeitschriftenaufsatz
2. Peer Ethnicity and Achievement: A Meta-Analysis into the Compositional Effect Autoren: van Ewijk, Reyn; Sleegers, Peter Typ: Zeitschriftenaufsatz