References
Plicopurpura pansa shells © http://traditionsmexico.phanfare.com/2402728
Alamo, V and Valdivieso, V 1997, Lista Sistemática de Moluscos Marinos del Perú. 2da, Perú.
Chavez, EA and Michel-Morfin, JE 2006, 'Strategies for sustainable dye harvest of the purple conch Plicopurpura pansa (Gould, 1853) from west central Mexico', American Malacological Bulletin vol 21, no. 1/2, pp 51.
Keen, AM 1971, Sea shells of tropical west America: Marine mollusks from Baja California to Peru, Stanford Univ Press, Stanford, California.
Michel-Morfin, JE, Chavez, EA and Landa, V 2000, 'Population parameters and dye yield of the purple snail Plicopurpura pansa (Gould, 1853) of west central Mexico', Journal of Shellfish Research vol 19, no. 2, pp 919–926.
Michel-Morfin, J E, Hernandez, M and Landa-Jaime, V 2009, 'Estimation of the Abundance and Population Structure of the Purple Snail Plicopurpura pansa (Gould, 1853) Comparing Two Methods', The Open Marine Biology Journal vol 3, pp 49–58.
Naegel, LCA 2005, 'The effect of periodically “milking” to obtain Tyrian Purple from Plicopurpura pansa (Gould, 1853) on the frequency of expulsion and mortality', Journal of Shellfish Research vol 24, no. 1, pp 85–90.
