The Oeconomicus (Greek: Οἰκονομικός) by Xenophon is a work about management of the household or oikos, the original root of our modern term, economics.
The bulk of the dialogue consists of a discussion between Socrates and the wealthy farmer Ischomachus, as recounted by Socrates in a framing introduction to Critobolous, son of Crito. Ischomachus' account of his relationship with his wife has been a frequent topic in modern debates about Greek social attitudes.
Free online texts
Gutenberg: Oeconomicus, translated by H.G. Dakyns. Multiple formats.
Internet Archive: Xenophon's Minor Works, translated by John Selby Watson. Multiple formats.
Internet Archive: L 168 Xenophon IV Memorabilia Oeconomicus Symposium Apologia. Loeb edition, Greek text with English translations by E.C. Marchant and O.J Todd. Multiple formats.
University of Adelaide (Internet Archive): Oeconomicus, translated by H.G. Dakyns. Multiple formats.
Wikisource: Greek text. HTML and other formats.
BBC Radio 4 In Our Time: Xenophon. Melvyn Bragg with Paul Cartledge, Edith Hall and Simon Goldhill.
Binghamton University: Study Guides - Ancient sexuality and Gender - Xenophon's Oeconomicus.
Diotima: How to Train a Wife, from Women's Life in Greece and Rome. A Source Book in Translation by Mary R. Lefkowitz and Maureen B. Fant (1992).
Internet Encyclopedia of Philosophy: Xenophon.
Leo Strauss Center: Xenophon, Oeconomicus and Memorabilia (St. John’s College Annapolis), 1969-70. Audio recordings of Strauss's lectures.
The Great Conversation Further reading at Tom's Learning Notes.
Aristotle: The Politics
Cicero: On Old Age - Chapter 17 imitates the discussion between Cyrus and Lysander in chapter 4 of the Oeconomicus.
Ancient Greek resources: Learn to read Greek classics in the original.