Liefferink, J. (1995). Environmental policy on the way to Brussels: The issue of acidification between the Netherlands and the European Community. s.n.].
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Liefferink, J.D. Environmental Policy on the Way to Brussels: The Issue of Acidification Between the Netherlands and the European Community. [S.l.: s.n.], 1995.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Liefferink, J.D. Environmental Policy on the Way to Brussels: The Issue of Acidification Between the Netherlands and the European Community. s.n.], 1995.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.