Er zijn nog geen Nederlandstalige annotaties. Hier volgen annotaties in het Engels.
- Marc Waelkens, Norman Herz, Luc Moens, Ancient Stones: Quarrying, Trade and Provenance : Interdisciplinary Studies on Stones and Stone Technology in Europe and Near East from the Prehistoric to the Early Christian Period, AAL 4 , Leuven University Press 1992, p. 21nn
- Patrick Degryse, Jan Elsen, Industrial Minerals: Resources, Characteristics, and Applications, Leuven University Press 2003