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.
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.
A great variety of monographs dealing with separate rivers and basins are available; e.g.
sqq.); Nikolai Ivanovich Kostomarov (1817-1885), professor of history at Kiev and St Petersburg, whose monographs and researches are collected in his Sobranye sochinenye (collected works, 21 vols., St Petersburg, 1903-6); V.