Walker Sally M. (2008). Early Bird Physics Screws. Lerner.
Cita Chicago (17th ed.)Walker Sally M. Early Bird Physics Screws. UK: Lerner, 2008.
Cita MLA (9th ed.)Walker Sally M. Early Bird Physics Screws. Lerner, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.