Ministry of Environment and Sports: Department of Conservation Services. "Bermuda Species". West Indian Topshell (Cittarium pica). Government of Bermuda. Archived from the original on 7 February 2011. Retrieved 6 October 2010.
Toller, W. (2003). "U.S.V.I. Animal Fact Sheet #15 Whelk"(PDF). Department of Planning and Natural Resources Division of Fish and Wildlife. Archived from the original(PDF) on 16 August 2011. Retrieved 13 October 2009.
Sartwell, T. Wood, J. B.; Valdivia, A. (eds.). "Marine Invertebrates of Bermuda". West Indian Top Shell (Cittarium pica). BBSR. Retrieved 19 April 2010.
web.archive.org
Toller, W. (2003). "U.S.V.I. Animal Fact Sheet #15 Whelk"(PDF). Department of Planning and Natural Resources Division of Fish and Wildlife. Archived from the original(PDF) on 16 August 2011. Retrieved 13 October 2009.
Ministry of Environment and Sports: Department of Conservation Services. "Bermuda Species". West Indian Topshell (Cittarium pica). Government of Bermuda. Archived from the original on 7 February 2011. Retrieved 6 October 2010.