Não informado. Planning: A broadsheet issued by PEP. Political and Economic Planning.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Planning: A Broadsheet Issued by PEP. London: Political and Economic Planning.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Planning: A Broadsheet Issued by PEP. Political and Economic Planning.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.