Rick T.C, Vellanoweth R.L, Erlandson J.M.  2005.  Radiocarbon dating and the "old shell" problem: direct dating of artifacts and cultural chronologies in coastal and other aquatic regions. Journal of Archaeological Science. 32(11):1641-1648.

Rick T.C, Vellanoweth R.L, Erlandson J.M, Kennett D.J.  2002.  On the antiquity of the single-piece shell fishhook: AMS radiocarbon evidence from the southern California coast. Journal of Archaeological Sciences. 29:933-942.