APA (7th ed.) Citation

Greenfield, E., Layton, R., & March, I. (1993). The Penguin guide to opera on compact disc (1. publ.). Penguin Books.

Chicago Style (17th ed.) Citation

Greenfield, Edward, Robert Layton, and Ivan March. The Penguin Guide to Opera on Compact Disc. 1. publ. London u.a: Penguin Books, 1993.

MLA (9th ed.) Citation

Greenfield, Edward, et al. The Penguin Guide to Opera on Compact Disc. 1. publ. Penguin Books, 1993.