Herd, C. P., Tomlinson, C. L., Deane, K. H., Brady, M. C., Smith, C. H., Sackley, C. M., & Clarke, C. E. (2012). Comparison of speech and language therapy techniques for speech problems in Parkinson's disease. Cochrane Database Syst Rev.

Herd, Clare P., Claire L. Tomlinson, Katherine HO Deane, Marian C. Brady, Christina H. Smith, Catherine M. Sackley, and Carl E. Clarke. "Comparison of Speech and Language Therapy Techniques for Speech Problems in Parkinson's Disease." Cochrane Database Syst Rev 2012.

Herd, Clare P., et al. "Comparison of Speech and Language Therapy Techniques for Speech Problems in Parkinson's Disease." Cochrane Database Syst Rev 2012.