Trevelyan, George Macaulay, 1876-1962, author
Penguin Books, 1979
Buku Teks
compiled by Jonathan French Scott and Alexander Baltzly
F.S. Crofts & Co., 1930
Buku Teks
Ruhl, Klaus-Jörg
Droste Verlag GmbH, 1981
Buku Teks
Oxford University Press , 1996
Buku Teks
Colorado Westview Press. , 1989
Buku Teks