Cita APA (7th ed.)

unknown. (2009). Flip the Flaps Planet Earth. Unknown.

Cita Chicago (17th ed.)

unknown. Flip the Flaps Planet Earth. Unknown, 2009.

Cita MLA (9th ed.)

unknown. Flip the Flaps Planet Earth. Unknown, 2009.

Atenció: Aquestes cites poden no estar 100% correctes.