This section includes introductory and intermediate resources for metaethics. It includes links to open education textbooks with chapters on metaethics that can be used for a brief introduction to meta-ethics, as well as original source readings on topics in meta-ethics. A link to Plato's Euthyphro is included for discussion of the Euthyphro problem, which is related to criticisms of Divine Command Theory and issues having to do with the source and justification of moral judgments. As well, portions of Hume's Treatise is included as it regards the source and justification of moral judgments. There are also links to G. E. Moore's Open Question argument and other links to help students understand the main issues in metaethics. The textbook chapters and original source materials can be used together to orient students to the main issues, as well as to introduce them to the original arguments.