Isadora, R. (2009). Happy belly, happy smile. Harcourt Children's Books.
Cita Chicago (17th ed.)Isadora, Rachel. Happy Belly, Happy Smile. Boston: Harcourt Children's Books, 2009.
Cita MLA (8th ed.)Isadora, Rachel. Happy Belly, Happy Smile. Harcourt Children's Books, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.