Trevelyan, George Macaulay, 1876-1962
Longmans, Green, 1950
Buku Teks SO
edited and introduced by Richard Wilson and Richard Dutton
Longman, 1992
Buku Teks SO
edited by Arthur F. Kinney and Thomas Warren Hopper
Wiley/Balckwell, 2017
Buku Teks SO
Wooden, Warren W.
University Press of Kentucky, 1986.
Buku Teks SO
Grant, Patrick
Macmillan, 1979
Buku Teks SO