APA

Perkonigg A., Settele A., Pfister H., Höfler M., Fröhlich C., Zimmermann P., Lieb R. & Wittchen H. (20070103). Where have they been? Service use of regular substance users with and without abuse and dependence. : Social psychiatry and psychiatric epidemiology.

Chicago

Perkonigg Axel, Settele Angela, Pfister Hildegard, Höfler Michael, Fröhlich Christine, Zimmermann Petra, Lieb Roselind and Wittchen Hans-Ulrich. 20070103. Where have they been? Service use of regular substance users with and without abuse and dependence. : Social psychiatry and psychiatric epidemiology.

Harvard

Perkonigg A., Settele A., Pfister H., Höfler M., Fröhlich C., Zimmermann P., Lieb R. and Wittchen H. (20070103). Where have they been? Service use of regular substance users with and without abuse and dependence. : Social psychiatry and psychiatric epidemiology.

MLA

Perkonigg Axel, Settele Angela, Pfister Hildegard, Höfler Michael, Fröhlich Christine, Zimmermann Petra, Lieb Roselind and Wittchen Hans-Ulrich. Where have they been? Service use of regular substance users with and without abuse and dependence. : Social psychiatry and psychiatric epidemiology. 20070103.