1. Royal College of Speech and Language Therapists (RCSLT). Communicating quality 2. London: RCSLT, 1996.
2. British Dietetic Association (BDA). National Descriptors for Texture Modification in Adults, 2009.
3. Logemann J. Manual for the videofluorographic study of swallowing. 2nd ed. Austin: Pro-Ed; 1993.
4. Logemann J. Evaluation and treatment of swallowing disorders. 2nd ed. Austin: Pro-Ed; 1998.
5. Langmore S. Endoscopic evaluation and treatment of swallowing disorders. New York: Thieme; 2001.