APA (7th ed.) Zitazioa

Ward, W. [. o. c. (2017). Singers' throat troubles: Their cause and cure. Norderstedt.

Chicago Style (17th ed.) Zitazioa

Ward, Whitfield. [from old catalog]. Singers' Throat Troubles: Their Cause and Cure. Hansebooks GmbH: Norderstedt, 2017.

MLA (9th ed.) Zitazioa

Ward, Whitfield. [from old catalog]. Singers' Throat Troubles: Their Cause and Cure. Norderstedt, 2017.