Cita APA (7th ed.)
Epicurus, Diogenes Laertius, Fieser, J., & Hicks, R. D. (2001). Letter on happiness. Infomotions, Inc. ; Virginia Tech..
Cita Chicago (17th ed.)
Epicurus, Diogenes Laertius, James Fieser, i Robert Drew Hicks. Letter on Happiness. [South Bend, IN] : [Blacksburg, VA]: Infomotions, Inc. ; Virginia Tech., 2001.
Cita MLA (9th ed.)
Epicurus, et al. Letter on Happiness. Infomotions, Inc. ; Virginia Tech., 2001.
Atenció: Aquestes cites poden no estar 100% correctes.