Dyfyniad APA
(1993). Environmental dilemmas: Ethics and decisions. Chapman and Hall.
Dyfyniad Arddull Chicago
Environmental Dilemmas: Ethics and Decisions. New York: Chapman and Hall, 1993.
Dyfyniad MLA
Environmental Dilemmas: Ethics and Decisions. Chapman and Hall, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.