APA (7th ed.) Citation

Dent, E. J. (1940). Opera... Penguin books limited.

Chicago Style (17th ed.) Citation

Dent, Edward J. Opera... Harmondsworth, Middlesex, Eng., New York: Penguin books limited, 1940.

MLA (9th ed.) Citation

Dent, Edward J. Opera... Penguin books limited, 1940.