Cita APA (7a ed.)

Macfarren, G. A., & Oxenford, J. (1864). Helvellyn: An opera in four acts. Cramer.

Cita Chicago Style (17a ed.)

Macfarren, G. A., y John Oxenford. Helvellyn: An Opera in Four Acts. London: Cramer, 1864.

Cita MLA (8a ed.)

Macfarren, G. A., y John Oxenford. Helvellyn: An Opera in Four Acts. Cramer, 1864.