Campion & Lidderdale, D. W. S. (1953). European parliamentary procedure: A comparative handbook. Printed and published by the Inter-parliamentary Union on behalf of its Autonomous Section of Secretaries-General of Parliaments, Allen and Unwin.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Campion و D. W. S. Lidderdale. European Parliamentary Procedure: A Comparative Handbook. London: Printed and published by the Inter-parliamentary Union on behalf of its Autonomous Section of Secretaries-General of Parliaments, Allen and Unwin, 1953.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Campion و D. W. S. Lidderdale. European Parliamentary Procedure: A Comparative Handbook. Printed and published by the Inter-parliamentary Union on behalf of its Autonomous Section of Secretaries-General of Parliaments, Allen and Unwin, 1953.