Regulation (EC) No. 110/2008 on the definition, description, presentation, labelling and the protection of geographical indications of spirit drinks Regulation (EC) No 110/2008., Annex II paragraph 6 (grape marc spirit) and Annex III (geographical indications)
al-Hassan, Ahmad Y. (2009). "Alcohol and the Distillation of Wine in Arabic Sources from the 8th Century". Studies in al-Kimya': Critical Issues in Latin and Arabic Alchemy and Chemistry. Hildesheim: Georg Olms Verlag. pp. 283–298. (same content also available on the author's website). See also Berthelot, Marcellin; Houdas, Octave V. (1893). La Chimie au Moyen Âge. Vol. I. Paris: Imprimerie nationale. vol. I, pp. 141, 143.