Citazione Stile APA (7a Edizione)

singer, p. (1993). Practical Ethics (2nd.). cambridge University Press.

Citazione stile Chigago Style (17a edizione)

singer, peter. Practical Ethics. 2nd. Cambridge: cambridge University Press, 1993.

Citatione MLA (9a ed.)

singer, peter. Practical Ethics. 2nd. cambridge University Press, 1993.