^"BAGA". Vitis International Variety Catalogue VIVC. Julius Kühn-Institut - Federal Research Centre for Cultivated Plants (JKI), Institute for Grapevine Breeding - Geilweilerhof (ZR). August 2017. Retrieved 2017-09-23.
^ J. Robinson Jancis Robinson's Wine Course Third Edition pg 130 Abbeville Press 2003 ISBN0-7892-0883-0