https://www.euda.europa.eu/publications/technical-reports/european-questionnaire-drug-use-among-prisoners-eqdp-short_ru
European Questionnaire on Drug Use among People living in prison (EQDP) (Short version) | The...
https://www.euda.europa.eu/publications/technical-reports/european-questionnaire-drug-use-among-prisoners-eqdp-methodological-guidelines_mk
European Questionnaire on Drug Use among People living in prison (EQDP): Methodological guidelines...