Ward, W. [. o. c. (2017). Singers' throat troubles: Their cause and cure. Norderstedt.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWard, Whitfield. [from old catalog]. Singers' Throat Troubles: Their Cause and Cure. Hansebooks GmbH: Norderstedt, 2017.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWard, Whitfield. [from old catalog]. Singers' Throat Troubles: Their Cause and Cure. Norderstedt, 2017.
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