Cita APA (7th ed.)

Bernhart, W., Kramer, L., & Sousa Correa, D. d. (2014). On voice. Rodopi.

Cita Chicago (17th ed.)

Bernhart, Walter, Lawrence Kramer, i Delia da Sousa Correa. On Voice. Amsterdam, Netherlands: Rodopi, 2014.

Cita MLA (9th ed.)

Bernhart, Walter, et al. On Voice. Rodopi, 2014.