Cita APA (7th ed.)

SHELDON, S. (2001). SKY IS FALLING. HARPERCOLLINSPUBLISHERS.

Cita Chicago (17th ed.)

SHELDON, SIDNEY. SKY IS FALLING. GREAT BRAIN: HARPERCOLLINSPUBLISHERS, 2001.

Cita MLA (9th ed.)

SHELDON, SIDNEY. SKY IS FALLING. HARPERCOLLINSPUBLISHERS, 2001.