@book {heyd1982_supererogation,
	title = {Supererogation: Its Status in Ethical Theory},
	year = {1982},
	note = {A German translation of Chap. 8 appears in G. Nunner Winkler (ed.), Weibliche Moral (Frankfurt: Campus Verlag, 1991), pp. 257-270.},
	publisher = {Cambridge University Press},
	organization = {Cambridge University Press},
	address = {Cambridge note = Paperback edition, 2009.},
	author = {Heyd, David}
}
