Blanco, Carlos A.; Rojas, Antonio; Caballero, Pedro A.; Ronda, Felicidad; Gomez, Manuel; Caballero, Isabel «A better control of beer properties by predicting acidity of hop iso-α-acids». Trends in Food Science & Technology, 17, 7, 2006, pàg. 373. DOI: 10.1016/j.tifs.2005.11.012.
Esslinger, H. M. and Narziss, L. 2003. “Beer.” in Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH Verlag GmbH & Co. KGaA, 2009 doi:10.1002/14356007.a03_421