Anna Kokkevi

The 1999 ESPAD report: alcohol and other drug use among students in 30 European countries.

Barbro Andersson, Mark Morgan, T. Bjarnason, 1997 .

Early Adolescent and Peer Drinking Homogeneity

Emmanuel Kuntsche, Bruce G Simons-Morton, B. Simons-Morton, 2012, The Journal of early adolescence.

The 2007 ESPAD report : substance use among students in 35 European countries

Patrick Miller, Martin Plant, Ludwig Kraus, 2009 .

The 2011 Espad Report

Ludwig Kraus, T. Bjarnason, B. Hibell, 2011 .