Smedley, J.W. and C.M. Jackson. "Medieval and post-medieval glass technology: a review of bracken in glassmaking." Glass Technology: European Journal of Glass Science 43/6 (December 2002): 221-224.

Smedley, J.W. and C.M. Jackson. "Medieval and post-medieval glass technology: a review of bracken in glassmaking." Glass Technology: European Journal of Glass Science 43/6 (December 2002): 221-224.