Partridge, J., & Sweeten, S. (2001). Blowing Bubbles. Cambridge University Press.
Cita Chicago (17th ed.)Partridge, Juliet, i Sami Sweeten. Blowing Bubbles. Cambridge: Cambridge University Press, 2001.
Cita MLA (8th ed.)Partridge, Juliet, i Sami Sweeten. Blowing Bubbles. Cambridge University Press, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.