Siffer, B. What next for the Sp.a?: Ending the reign of fear. Annual Review 2008-2009. The bizarre political world of Belgium. Social Democrats at a turning point? : electoral defeat in june 2007, 135-141.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Siffer, Björn. "What Next for the Sp.a?: Ending the Reign of Fear." Annual Review 2008-2009. The Bizarre Political World of Belgium. Social Democrats at a Turning Point? : Electoral Defeat in June 2007 : 135-141.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Siffer, Björn. "What Next for the Sp.a?: Ending the Reign of Fear." Annual Review 2008-2009. The Bizarre Political World of Belgium. Social Democrats at a Turning Point? : Electoral Defeat in June 2007, , pp. 135-141.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.