 Janello, Martin (2013) Philosophy of Happiness, Palioxis Publishing, 1000 pages, Long, A. A., and D.N. Sedley, The Hellenistic Philosophers, vol 1 and 2 (Cambridge: Cambridge University Press, 1987) McMahon, Darrin M. (2005). Happiness: A History. Atlantic Monthly Press. —— (2004) "The History of Happiness: 400 B.C. – A.D. 1780." Daedalus (Spring 2004).
<coherence>  Janello, Martin (2013) Philosophy of Happiness, Palioxis Publishing, 1000 pages, Long, A. A., and D.N. Sedley, The Hellenistic Philosophers, vol 1 and 2 (Cambridge: Cambridge University Press, 1987) McMahon, Darrin M. (2005). Happiness: A History. Atlantic Monthly Press. —— (2004) "The History of Happiness: 400 B.C. – A.D. 1780." Daedalus (Spring 2004).
 Janello, Martin (2013) Philosophy of Happiness, Palioxis Publishing, 1000 pages, Long, A. A., and D.N. Sedley, The Hellenistic Philosophers, vol 1 and 2 (Cambridge: Cambridge University Press, 1987) 