@book{292650,
	author = {Villarreal, Omar and Foppoli, Julio},
	title = {Polimodal english : resource file level 2. Natural sciences = ciencias naturales / Omar Villarreal, Julio Foppoli},
	publisher = {Macmillan Heinemann ELT},
	year = {1999},
	address = {Oxford}
}