"Arkivita kopio" (PDF). Arkivita el la originalo (PDF) en 2015-08-07. [2] Alirita la 24an de Julio 2018.
What Is Bioengineering? Arkivita en 2013-01-23 ĉe Wayback Machine. Bionewsonline.com. Alirita la 24an de Julio 2018.
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See Arnold, John P.. (2005) Origin and History of Beer and Brewing: From Prehistoric Times to the Beginning of Brewing Science and Technology. Cleveland, Ohio: BeerBooks. ISBN 978-0-9662084-1-2. OCLC71834130.
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