A foreign article or particle in a personal or business name is combined with the part of the name following it to form a single indexing unit. The indexing order is not affected by a space between a prefix and the rest of the name (Alexander La Guardia), and the space is disregarded when indexing.
Example of articles and particles are: a la, D’, Da, De, Del, De La, Della, Den, Des, Di, Dos, Du, E’, El, Fitz, Il, L’, La, Las, Le, Les, Lo, Los, M’, Mac, Mc, O’, Per, Saint, San, Santo, Santo, St., Ste., Te, Ten, Ter, Va, Van de, Van der, Von, Von der.