Não informado. Planning: A broadsheet issued by PEP. Political and Economic Planning.
Chicago-viite (17. p.)Não informado. Planning: A Broadsheet Issued by PEP. London: Political and Economic Planning.
MLA-viite (8. p.)Não informado. Planning: A Broadsheet Issued by PEP. Political and Economic Planning.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.