APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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