Apollinaris Sidonius (the names are commonly inverted by the French) is the subject of numerous monographs, historical and literary.
For a comprehensive bibliography, including monographs and published documents, see Ulysse Chevalier, Repertoire des sources hist.
On particular authors and subjects there are many excellent monographs in the Jewish Encyclopaedia (New York, 1901-6), to which the present article is much indebted.
Allied to the Silphidae are a number of small and obscure families, for which reference must be made to monographs of the order.
Considerable diversity is to be noticed in details of structure within this group, and for an enumeration of all the various families which have been proposed and their distinguishing characters the reader is referred to one of the monographs mentioned below.