Gert-Jan Hospers (2002). Beyond the Blue Banana? Structural Change in Europe's Geo-Economy(PDF). 42nd EUROPEAN CONGRESS of the Regional Science Association Young Scientist Session – Submission for EPAINOS Award 27–31 August 2002. Dortmund, Almanya. 18 Mart 2020 tarihinde kaynağından arşivlendi(PDF). Erişim tarihi: 21 Ocak 2017.
Gert-Jan Hospers (2002). Beyond the Blue Banana? Structural Change in Europe's Geo-Economy(PDF). 42nd EUROPEAN CONGRESS of the Regional Science Association Young Scientist Session – Submission for EPAINOS Award 27–31 August 2002. Dortmund, Almanya. 18 Mart 2020 tarihinde kaynağından arşivlendi(PDF). Erişim tarihi: 21 Ocak 2017.