Töttel, U., Bulanova-Hristova, G., & Büchler, H. (2011). Research Conferences on Organised Crime at the Bundeskriminalamt in Germany (Vol. II) 2011 - 2012: Edited by Ursula Töttel, Gergana Bulanova-Hristova, Heinz Büchler. Luchterhand.

Töttel, Ursula, Gergana Bulanova-Hristova, and Heinz Büchler. Research Conferences on Organised Crime at the Bundeskriminalamt in Germany (Vol. II) 2011 - 2012: Edited by Ursula Töttel, Gergana Bulanova-Hristova, Heinz Büchler. Köln: Luchterhand, 2011.

Töttel, Ursula, et al. Research Conferences on Organised Crime at the Bundeskriminalamt in Germany (Vol. II) 2011 - 2012: Edited by Ursula Töttel, Gergana Bulanova-Hristova, Heinz Büchler. Luchterhand, 2011.