APA-referens (7:e uppl.)
KOKKEVI, A., & ET AL. (2007). FURTHER INVESTIGATION OF PSYCHOLOGICAL AND ENVIRONMENTAL CORRELATES OF SUBSTANCE USE IN ADOLESCENCE IN SIX EUROPEAN COUNTRIES.
Chicago-referens (17:e uppl.)
KOKKEVI, A.E, och ET AL. FURTHER INVESTIGATION OF PSYCHOLOGICAL AND ENVIRONMENTAL CORRELATES OF SUBSTANCE USE IN ADOLESCENCE IN SIX EUROPEAN COUNTRIES. 2007.
MLA-referens (9:e uppl.)
KOKKEVI, A.E, och ET AL. FURTHER INVESTIGATION OF PSYCHOLOGICAL AND ENVIRONMENTAL CORRELATES OF SUBSTANCE USE IN ADOLESCENCE IN SIX EUROPEAN COUNTRIES. 2007.
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