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.
Atenció: Aquestes cites poden no estar 100% correctes.