The most commonly used citation style in the UK is the Harvard referencing style, particularly in social sciences and business. This style follows an author-date format, where the author's name and publication year are cited within the text, and full details are included in the bibliography. Other styles used in the UK include MHRA (Modern Humanities Research Association), popular in arts and humanities, and OSCOLA (Oxford University Standard for the Citation of Legal Authorities) for law. The choice of citation style largely depends on the academic field and institutional guidelines.