APA (7 वां संस्करण) प्रशस्ति पत्र

Christy, V. A. (1961). Expressive singing: A textbook for school or studio class or private teaching. Wm.C. Brown Co..

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Christy, Van Ambrose. Expressive Singing: A Textbook for School or Studio Class or Private Teaching. Dubuque, Iowa: Wm.C. Brown Co., 1961.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Christy, Van Ambrose. Expressive Singing: A Textbook for School or Studio Class or Private Teaching. Wm.C. Brown Co., 1961.