Johns MM, Sataloff RT, Merati AL, Rosen CA (tháng 8 năm 2010). “Shortfalls of the American Academy of Otolaryngology-Head and Neck Surgery's Clinical practice guideline: Hoarseness (Dysphonia)”. Otolaryngology–Head and Neck Surgery. 143 (2): 175–7, discussion 175–80. doi:10.1016/j.otohns.2010.05.026. PMID20647114.
Johns MM, Sataloff RT, Merati AL, Rosen CA (tháng 8 năm 2010). “Shortfalls of the American Academy of Otolaryngology-Head and Neck Surgery's Clinical practice guideline: Hoarseness (Dysphonia)”. Otolaryngology–Head and Neck Surgery. 143 (2): 175–7, discussion 175–80. doi:10.1016/j.otohns.2010.05.026. PMID20647114.