Tavakoli, P. ORCID: https://orcid.org/0000-0003-0807-3709, Campbell, C. and McCormack, J. (2016) Development of speech fluency over a short period of time: effects of pedagogic intervention. TESOL Quarterly, 50 (2). pp. 447-471. ISSN 1545-7249 doi: https://doi.org/10.1002/tesq.244

Radley, P., Simons, D. and Campbell, C. (2005) Horizons 1 student's book. Oxford University Press, Oxford, pp112. ISBN 9780194388764

Radley, P., Simons, D. and Campbell, C. (2005) Horizons 2 student's book. Oxford University Press, Oxford, pp112. ISBN 9780194388771

Radley, P., Simons, D. and Campbell, C. (2005) Horizons 3 student's book. Oxford University Press, Oxford, pp112. ISBN 9780194388788

Radley, P., Simons, D. and Campbell, C. (2005) Horizons 4 student's book. Oxford University Press, Oxford, pp112. ISBN 9780194388795

Radley, P., Simons, D. and Campbell, C. (2005) Horizons 4 teacher's book. Oxford University Press, Oxford, pp112. ISBN 9780194387156