1. HarperCollins, Collins English Dictionary
2. Oxford University Press, Oxford Dictionaries
3. Gaines S, White SC, Devine J, Jha S (2010) Religion, development and well being in India. WP 54
4. Gregoire C (2013) Living well, according to some of the wisest people who ever lived. The Huffington Post
5. OECD (2017) Better life index—edition 2017