Cita APA (7th ed.)

Grass, G. (1972). Four plays. Penguin Books.

Cita Chicago (17th ed.)

Grass, Gunter. Four Plays. Harmondsworth, Middlesex, England: Penguin Books, 1972.

Cita MLA (9th ed.)

Grass, Gunter. Four Plays. Penguin Books, 1972.