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Google books Charles W. Bamforth, Beer: Tap Into the Art and Science of Brewing pp. 58–59, Oxford University Press US (2003), ISBN 0-19-515479-7. Retrieved 29 September 2008.
Google Books T. Boekhout, Vincent Robert, Yeasts in Food: Beneficial and Detrimental Aspects pp. 370–371, Behr's Verlag DE (2003), ISBN 3-86022-961-3. Retrieved 29 September 2008.
cat.inist.fr, A better control of beer properties by predicting acidity of hop iso-α-acids, Blanco Carlos A.; Rojas Antonio; Caballero Pedro A.; Ronda Felicidad; Gomez Manuel; Caballero. Retrieved 13 September 2008.
