Partridge, J., & Sweeten, S. (2001). Blowing Bubbles. Cambridge University Press.
Dyfyniad Arddull ChicagoPartridge, Juliet, and Sami Sweeten. Blowing Bubbles. Cambridge: Cambridge University Press, 2001.
Dyfyniad MLAPartridge, Juliet, and Sami Sweeten. Blowing Bubbles. Cambridge University Press, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.