@article {YONG1984,
	title = {{A preliminary study of the freshwater mollusks of the Isle of Youth (Isle of Pines), Cuba}},
	journal = {Walkerana},
	volume = {2},
	number = {7},
	year = {1984},
	pages = {121{\textendash}123},
	author = {YONG, M. and G. PERERA}
}
@book {760,
	title = {Apple Snails in the Aquarium},
	year = {1996},
	pages = {121 pp},
	publisher = {T.F.H. Publications, Inc},
	organization = {T.F.H. Publications, Inc},
	address = {Neptune City, New Jersey},
	author = {G. PERERA and Walls, J. G.}
}
