Botsford, _Roman Assemblies_, chs. iii–xiii; Cavaignac, _Histoire_, ii,
pp. 478–83; De Sanctis, _Storia_, ii, chs. xii, xiv, xvii; Frank,
_Economic History_, chs. iii–iv; Heitland, _Roman Republic_, ii, chs.
viii–xiv, xvi, xx; Kahrstedt, U., _Zwei Beiträge Zur älteren röm.
Geschichte_, _Rh. Museum_, 1918; Mommsen, Th., _Staatsrecht_ (see
Indices); Niese, _Geschichte_, pp. 81–84; Pais, _Storia Critica_, as for
Chap. V.