Willems, H. (1995). Development, Patterns and Causes of Violence against Foreigners in Germany: Social and Biographical Characteristics of Perpetrators and the Process of Escalation. Terror from the extreme right.
Lua i Stíl Chicago (17ú heag.)Willems, Helmut. "Development, Patterns and Causes of Violence Against Foreigners in Germany: Social and Biographical Characteristics of Perpetrators and the Process of Escalation." Terror from the Extreme Right 1995.
Lua MLA (8ú heag.)Willems, Helmut. "Development, Patterns and Causes of Violence Against Foreigners in Germany: Social and Biographical Characteristics of Perpetrators and the Process of Escalation." Terror from the Extreme Right, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.