The 2011 ESPAD report : substance use among students in 36 European countries / Björn Hibell ... [et al.] ; with the contribution of Airi-Alina Allaste ... [et al.]. Stockholm : The Swedish Council for Information on Alcohol and Other Drugs, c2012. 390 s. ISBN 978-91-7278-233-4   [1, z toho volných 1]