Life Books (Firm). (2003). The seven wonders of the world. Life Books.
Cita Chicago Style (17a ed.)Life Books (Firm). The Seven Wonders of the World. New York: Life Books, 2003.
Cita MLA (8a ed.)Life Books (Firm). The Seven Wonders of the World. Life Books, 2003.
Precaución: Estas citas no son 100% exactas.