General Order. Horse-Guards. 14th August, 1821. : In consequence of the orders for the court going into mourning for Her late Majesty, it is directed that the officers of the Army shall, on the present melancholy occasion, wear a black crape round their left arms with their uniforms
MLA
General Order. Horse-Guards. 14th August, 1821. : In Consequence of the Orders for the Court Going into Mourning for Her Late Majesty, It Is Directed That the Officers of the Army Shall, on the Present Melancholy Occasion, Wear a Black Crape Round Their Left Arms with Their Uniforms. Printed by W. Clowes, Northumberland-court, Strand, for HIs Majesty's Stationery-office, 0AD. https://collections.library.yale.edu/catalog/33111656.
APA, 6th edition
General Order. Horse-Guards. 14th August, 1821. : In consequence of the orders for the court going into mourning for Her late Majesty, it is directed that the officers of the Army shall, on the present melancholy occasion, wear a black crape round their left arms with their uniforms. (0 C.E.). [Military orders, Annotations (Provenance) 19th century]. Printed by W. Clowes, Northumberland-court, Strand, for HIs Majesty's Stationery-office. https://collections.library.yale.edu/catalog/33111656.