The Economics (Greek: Οἰκονομικά; Latin: Oeconomica) is a work attributed to Aristotle, although now more often thought to be by one of his followers. Its subject matter of household management reflects the origin of modern term economics in the Greek word for the household, oikos.
Free online texts
Internet Archive: The Oeconomica, translated by E.S. Forster (1920). Multiple formats.
Wikisource: Οικονομικά (Αριστοτέλης), Greek text.
Librivox: Economics - public domain audiobook.
Wikipedia: Economics (Aristotle).
The Great Conversation: Further reading at Tom's Learning Notes
Aristotle: The Politics.
Ancient Greek resources: Learn to read Greek classics in the original.