Não informado. Planning: A broadsheet issued by PEP. Political and Economic Planning.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Planning: A Broadsheet Issued by PEP. London: Political and Economic Planning.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Planning: A Broadsheet Issued by PEP. Political and Economic Planning.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.