The 2007 ESPAD report : substance use among students in 35 European countries / Björn Hibell ... [et al.] ; Airi-Alina Allaste ... [et al.]. Stockholm : The Swedish Council for Information on Alcohol and Other Drugs, [2009]. 406 s. ISBN 978-91-7278-219-8   [1, z toho voľných 1]