K Jordaens, L Dillen, T Backeljau (2007). “Effects of mating, breeding system and parasites on reproduction in hermaphrodites: pulmonate gastropods (Mollusca)”. Animal Biology. doi:10.1163/157075607780377965.
Leonard, J. L (2006). “Sexual selection: lessons from hermaphrodite mating systems”. Integrative and Comparative Biology46(4): 349-367. doi:10.1093/icb/icj041.