Ward, W. [. o. c. (2017). Singers' throat troubles: Their cause and cure. Norderstedt.
Chicago-referens (17:e uppl.)Ward, Whitfield. [from old catalog]. Singers' Throat Troubles: Their Cause and Cure. Hansebooks GmbH: Norderstedt, 2017.
MLA-referens (9:e uppl.)Ward, Whitfield. [from old catalog]. Singers' Throat Troubles: Their Cause and Cure. Norderstedt, 2017.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.