@book {567,
	title = {Icones rerum naturalium, quas in itinere orientali depingi curavit Petrus Forsk{\"a}l},
	year = {1776},
	pages = {15},
	publisher = {Hauniae (Moller)},
	organization = {Hauniae (Moller)},
	author = {C. Niebuhr}
}
@book {549,
	title = {Pseudothecosomata, gymnosomata and heteropoda (gastropoda)},
	year = {1976},
	pages = {484},
	publisher = {Bohn, Scheltema \& Holkeme Utrecht},
	organization = {Bohn, Scheltema \& Holkeme Utrecht},
	address = {Amsterdam},
	isbn = {9031301760},
	author = {S. Van Der Spoel}
}
