Gabbay, M., Mathers, N., Green, F., Exley, D., Atkins, T., Gallagher, M., & Brayford, D. (2005). PCRTA serendipitous carrot masquerading as stick? Oxford University Press.

Gabbay, Mark, Nigel Mathers, Fenny Green, Diane Exley, Tina Atkins, Monica Gallagher, και Dawn Brayford. PCRTA Serendipitous Carrot Masquerading As Stick? Oxford University Press, 2005.

Gabbay, Mark, et al. PCRTA Serendipitous Carrot Masquerading As Stick? Oxford University Press, 2005.