Franklin

MLA

Macfarren, G. A, and John Oxenford. Helvellyn: an Opera In Four Acts. London: Cramer, 1864.

APA

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

Chicago

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