APA (7th ed.) Citation

Epicurus, Diogenes Laertius, Fieser, J., & Hicks, R. D. (2001). Letter on happiness. Infomotions, Inc. ; Virginia Tech..

Chicago Style (17th ed.) Citation

Epicurus, Diogenes Laertius, James Fieser, and Robert Drew Hicks. Letter on Happiness. [South Bend, IN] : [Blacksburg, VA]: Infomotions, Inc. ; Virginia Tech., 2001.

MLA (9th ed.) Citation

Epicurus, et al. Letter on Happiness. Infomotions, Inc. ; Virginia Tech., 2001.