Macaulay, T.B. (Thomas Babington), author
Aldine-House, 1951
Buku Teks
Easton, Stewart C., author
Praeger, 1964
Buku Teks
Kotwal, O. P., author
McGraw-Hill, 1987
Buku Teks
Healey, Bede, author
Georgian House, 1972
Buku Teks
Crane, R.S., author
University of Chicago Press, 1971
Buku Teks