Sparks, Karen Jacobs. Encyclopaedia Británnica 2006. Book of the year.
Cita Chicago (17th ed.)Sparks, Karen Jacobs. Encyclopaedia Británnica 2006. Book of the Year.
Cita MLA (8th ed.)Sparks, Karen Jacobs. Encyclopaedia Británnica 2006. Book of the Year.
Atenció: Aquestes cites poden no estar 100% correctes.