1. Aristotle, & Ross, W. D. (1999). Nicomachean ethics. Batoche Books.
2. Ayer, A. J. (1971). Language, truth and logic. Penguin.
3. Blackmore, S. J. (1999). The meme machine. Oxford University Press.
4. Bonner, W. (2014). Hormegeddon: How too much of a good thing leads to disaster. Lioncrest.
5. BusinessDictionary.com (Online dictionary) [Online]. Available: http://www.businessdictionary.com [Accessed].