Stuart J. Murphy. (2002). Double the Ducks (MathStart 1). HarperCollins.
Chicago-čujuhus (17. p.)Stuart J. Murphy. Double the Ducks (MathStart 1). HarperCollins, 2002.
MLA-čujuhus (9. p.)Stuart J. Murphy. Double the Ducks (MathStart 1). HarperCollins, 2002.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.