Παραπομπή APA

Velleman, S. L. (2016). Speech sound disorders. Wolters Kluwer.

Παραπομπή Chicago Style

Velleman, Shelley Lynn. Speech Sound Disorders. London: Wolters Kluwer, 2016.

Παραπομπή MLA

Velleman, Shelley Lynn. Speech Sound Disorders. Wolters Kluwer, 2016.