AGLC4 is a footnoting style (see Rule 1.1.1). Footnotes should be used to:
Refer to your Subject Outline or lecturer to confirm which version you should use.
AGLC4 continues the original aim of providing clear, concise and comprehensive rules for citation. Two significant changes in General Rules concern the use of subsequent references (Rule 1.4.1) and the widening of the rule for sources referring to other sources (Rule 1.3).
Other changes and new rules apply to General Rules, Cases, Legislation, Journal Articles, Books, Secondary Sources and range of international materials (including treaties, UN Materials, international courts and tribunals, international economic materials, supranational materials and foreign domestic jurisdictions).
For full details see Summary of Changes in AGLC4.