Vatican City State
- 1.United Nations, Department of Economic and Social Affairs, Population Division. World Urbanization Prospects, 2014.
- 2.United Nations, Department of Economic and Social Affairs. Trends in International Migrant Stock: The 2015 revision.
- 3.United Nations Office of Drugs and Crime, Homicide Statistics 2015.
- 4.Transparency International, Corruption Perceptions Index 2016.
- 5.UNICEF, State of the World's Children, 2016.
- 6. Statistical Yearbook of the Church, 2017 (Vatican City: Librera Editrice Vaticana, 2019).
- 7.World Economic Forum, The Global Gender Gap Report, 2016.