Dyfyniad APA

McDonald Klimek, M., Obert, K. B., & Steinhauer, K. (2005). Estill voice training system. Estill Voice Training Systems International.

Dyfyniad Arddull Chicago

McDonald Klimek, Mary, Kerrie B. Obert, and Kimberly Steinhauer. Estill Voice Training System. [Pittsburgh, Pa.]: Estill Voice Training Systems International, 2005.

Dyfyniad MLA

McDonald Klimek, Mary, et al. Estill Voice Training System. Estill Voice Training Systems International, 2005.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.