Lane-Poole, Stanley, 1854-1931
Methuen, 1968
Buku Teks SO
Alston, Richard
Routledge, 1995
Buku Teks SO
Spiro, Socrates, bey, 1868-, compiler
Elias Modern Press, 1929
Buku Referensi
Berger, Morroe
Princeton University Press, 1957
Buku Teks SO
Palmer, Robert Roswell, 1909-2002
McGraw-Hill, 1950
Buku Teks SO