OSCOLA stands for Oxford University Standard for Citation of Legal Authorities.
The style is designed to facilitate accurate citation of authorities, legislation, and other legal materials. It is widely used in law schools and by journal and book publishers in the UK and beyond. OSCOLA is edited by the Oxford Law Faculty, in consultation with the OSCOLA Editorial Advisory Board.
More information about using the OSCOLA referencing style on the Oxford Law Faculty website:
Oscola full guide
Oscola quick reference guide
OSCOLA 2006: Citing International Law (PDF)
OSCOLA (4th ed.) does not cover International Law. The OSCOLA website has a link to the 2006 version of the OSCOLA style that show how to cite international law.