Legal provisions for mandatory referendums at national level

See generally Graeme Orr ‘The Conduct of Referenda and Plebiscites in Australia: a Legal Perspective’ (2000) 11 Public Law Review 117

Constitution ss 128 and 123.

128. This Constitution shall not be altered except in the following manner:--

The proposed law for the alteration thereof must be passed by an absolute majority of each House of the Parliament, and not less than two nor more than six months after its passage through both Houses the proposed law shall be submitted in each State and Territory to the electors qualified to vote for the election of members of the House of Representatives. [...]