Craig, A, Tran, Y, The epidemiology of stuttering: The need for reliable estimates of prevalence and anxiety levels over the lifespan, in Advances in Speech–Language Pathology, vol. 7, n. 1, 2005, pp. 41–46, PMID17429528.
Yairi, E, Ambrose, N, Onset of stuttering in preschool children: selected factors, in Journal of speech and hearing research, vol. 35, n. 4, 1992, pp. 782–8, PMID1405533.
Andrews, G, Craig, A; Feyer, AM; Hoddinott, S; Howie, P; Neilson, M, Stuttering: a review of research findings and theories circa 1982, in The Journal of speech and hearing disorders, vol. 48, n. 3, 1983, pp. 226–46, PMID6353066.
Churchill: A Study in Oratory, su winstonchurchill.org, The Churchill Centre. URL consultato il 5 aprile 2005 (archiviato dall'url originale il 19 aprile 2005)..