APA-referens (7:e uppl.)

Christy, V. A., & Paton, J. G. (1990). Foundations in singing: A basic textbook in vocal technique and song interpretation (5th ed. medium-low voice ed.). W.C. Brown.

Chicago-referens (17:e uppl.)

Christy, Van Ambrose, och John Glenn Paton. Foundations in Singing: A Basic Textbook in Vocal Technique and Song Interpretation. 5th ed. medium-low voice ed. Dubuque, Iowa: W.C. Brown, 1990.

MLA-referens (9:e uppl.)

Christy, Van Ambrose, och John Glenn Paton. Foundations in Singing: A Basic Textbook in Vocal Technique and Song Interpretation. 5th ed. medium-low voice ed. W.C. Brown, 1990.