SpringerLink (Online service) & Forrester, C. (2011). High above: The untold story of Astra, Europe's leading satellite company. Springer eBooks..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSpringerLink (Online service) और Chris Forrester. "High Above: The Untold Story of Astra, Europe's Leading Satellite Company." Springer EBooks. 2011.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSpringerLink (Online service) और Chris Forrester. "High Above: The Untold Story of Astra, Europe's Leading Satellite Company." Springer EBooks., 2011.
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