Rizzo, R. (1978). The voice as an instrument (2d ed.). Indianapolis: Bobbs-Merrill Educational Pub..
استشهاد بنمط شيكاغوRizzo, Raymond. The Voice As an Instrument. 2d ed. Indianapolis: Bobbs-Merrill Educational Pub., 1978.
MLA استشهادRizzo, Raymond. The Voice As an Instrument. 2d ed. Indianapolis: Bobbs-Merrill Educational Pub., 1978.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.