Cita APA (7th ed.)
(2003). Students̐ Book Nature & Environment. Santillana.
Cita Chicago (17th ed.)
Students̐ Book Nature & Environment. Buenos Aires: Santillana, 2003.
Cita MLA (9th ed.)
Students̐ Book Nature & Environment. Santillana, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.