APA (7th ed.) Zitazioa

Obert, K. B., & Chicurel, S. R. (2005). Geography of the voice.

Chicago Style (17th ed.) Zitazioa

Obert, Kerrie B., eta Steven R. Chicurel. Geography of the Voice. Think Voice International, 2005.

MLA (9th ed.) Zitazioa

Obert, Kerrie B., eta Steven R. Chicurel. Geography of the Voice. 2005.