@mastersthesis {heyd1976_status_supererogatory_acts,
	title = {The Status of Supererogatory Acts in Ethical Theory},
	year = {1976},
	note = {Supervisors: S. N. Hampshire and G. J. Warnock},
	school = {University of Oxford},
	type = {phd},
	address = {Oxford},
	author = {Heyd, David}
}
