Camilla Rockwood. (2006). Chambers science factfinder. Chambers.
Cita Chicago (17th ed.)Camilla Rockwood. Chambers Science Factfinder. Edinberg: Chambers, 2006.
Cita MLA (9th ed.)Camilla Rockwood. Chambers Science Factfinder. Chambers, 2006.
Atenció: Aquestes cites poden no estar 100% correctes.