Religion and Morality
Stanford Encyclopedia of Philosophy entry on religion and morality
A short piece called “Godless Morality” by philosopher Peter Singer
Natural Law
Internet Encyclopedia of Philosophy entry on natural law
Stanford Encyclopedia of Philosophy entry on the natural law tradition
Catholic Encyclopedia entry on natural law
Psychological Egoism and Ethical Egoism
Stanford Encyclopedia of Philosophy entry on egoism
Internet Encyclopedia of Philosophy entry on egoism
Overview of some arguments concerning egoism from Sandra LaFave at West Valley College
Consequentialism
A general resource: Utilitarianism Resources
Peter Singer’s website, a famous living utilitarian
Stanford Encyclopedia of Philosophy entries:
Mill’s moral and political philosophy
Kant's Ethics
Stanford Encyclopedia of Philosophy entry on Kant's moral philosophy
Internet Encyclopedia of Philosophy entry on Kant's ethics
The Social Contract Tradition
Internet Encyclopedia of Philosophy entry on social contract theory
Contractarianism and animal rights
Stanford Encyclopedia of Philosophy entries:
Hobbes's moral and political philosophy
Ethical Pluralism and Ethical Particularism
Stanford Encyclopedia of Philosophy entries:
Virtue Ethics
Stanford Encyclopedia of Philosophy entries:
Internet Encyclopedia of Philosophy entry on virtue ethics
Feminist Ethics
Stanford Encyclopedia of Philosophy entry on feminist philosophy
The largest feminist organization in the United States: National Organization for Women (NOW)