Não informado. Planning: A broadsheet issued by PEP. Political and Economic Planning.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Planning: A Broadsheet Issued by PEP. London: Political and Economic Planning.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Planning: A Broadsheet Issued by PEP. Political and Economic Planning.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.