Não informado. Financial Times North Sea Letter and European Offshore News. Financial Times Business Information.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Financial Times North Sea Letter and European Offshore News. London: Financial Times Business Information.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Financial Times North Sea Letter and European Offshore News. Financial Times Business Information.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.