In addition to the limited entrenchment of direct election in the Australian Constitution, Western Australia is the only State with a requirement for direct election of its members of Parliament entrenched in its constitution, so that the requirement cannot be repealed without a referendum. See this 1978 provision in Section 73 of Western Australia’s Constitution Act 1889 [Section 73(2)(c)].
The Australian Capital Territory is the only Territory with an entrenched requirement for direct election of the members of its unicameral legislature.