Cita APA (7th ed.)

Stuart J. Murphy. (2002). Double the Ducks (MathStart 1). HarperCollins.

Cita Chicago (17th ed.)

Stuart J. Murphy. Double the Ducks (MathStart 1). HarperCollins, 2002.

Cita MLA (9th ed.)

Stuart J. Murphy. Double the Ducks (MathStart 1). HarperCollins, 2002.

Atenció: Aquestes cites poden no estar 100% correctes.