They are typically found in countries which are governed by a British style of parliamentary democracy such as the United Kingdom and the Commonwealth countries like Australia, Canada, India and New Zealand.
[1] "A statutory authority is a generic term for an authorisation by Parliament given to a person or group of people to exercise specific powers.
For example, the Commonwealth Scientific and Industrial Research Organisation (CSIRO) was established in 1949 by the Science and Industry Research Act, but it has since come under the jurisdiction of the Commonwealth Authorities and Companies Act 1997 as legislation covering statutory authorities has evolved.
Laws made by statutory authorities are usually referred to as regulations.
They are not cited in the same fashion as an act of parliament, but usually with specific initials (depending on the authority) and a number.