User:Qwazywabbit/Sandbox
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- Gunston, Bill (1993). World Encyclopedia of Aircraft Manufacturers. Annapolis: Naval Institute Press, 34.
- ^ Kiley, D. Driven:Inside BMW, the Most Admired Car Company in the World; Wiley 2004 ISDN 0-471-269-20-4
- ^ German Imperial Patent Office;patent no. 221388 issued on 10.12.1917
- ^ BMW Historical Archives; Bayerische Motoren Werke GmbH http://www.historicalarchive.bmw.com/2/index.php