Derry, Gregory N.
Princeton University Press , 1999
Buku Teks SO
Lloyd, G.E.R.
Cambridge University Press , 1991
Buku Teks SO
Landau, Rom, 1899-
Unwin Brothers, 1958
Buku Teks
Landau, Rom, 1899-
George Allen and Unwin, 1958
Buku Teks SO
Hiskett, M.
Longmas, Green, 1957
Buku Teks SO